This troper had this happen courtesy of her mother. Long story short, a girl she really liked had visited for a few days, and just as she was getting ready to leave and we were talking in the driveway it was becoming obvious that the feelings were mutual, so things naturally moved in the obvious direction towards a RelationshipUpgrade... and then her mother pulls in and chats for a few minutes about nothing, clearly not getting it. UGH.

Given that said girl dumped me 10 months later, maybe it was a sign...

This troper was talking to a pair of his friends when he got called over by a third friend. The conversation between me and that friend went something like: -> '''Friend:''' Sit here. -> '''This troper:''' Why? -> '''Friend:''' Because you're ruining their time together. -> '''This troper:''' ... eh? -> '''Friend:''' They're going out, you idiot. -> '''This troper:''' They are? -> '''Friend:''' You didn't notice all the hugging and stuff? God you're dense.

Happens constantly to this troper. Then he gets angry because (a) nobody informed him of the status change, and (b) he doesn't like it when people's statuses change. He was actually very happy for them because they make a perfect couple.

This troper was having lunch with a girl when one of her friends spontaneously showed up, basically ruining the direction the occasion was headed in.

Non-romantic example: this troper once walked in when her father and her brother were having their first civil conversation in weeks. She was pretty sure she'd ruined any chance of them reaching a vaguely-positive point in their relationship, but they promptly left and headed into the garage to continue where they'd left off. This troper breathed a sigh of relief.

This troper loudly farted at a wedding. It wasn't on purpose. Honest.

Usually every damn time I try talking to someone... many frequent offenders include a dumbass that acts annoying as all hell, or one of my more... ehm... estranged friends...

This is pretty much my job. I simply have the worst timing in the universe when it comes to friends' romantic interactions.

Yesterday, this troper was on the verge of a RelationshipUpgrade. I took the girl I'd been dating some roses, told her I liked her, and she reciprocated. But she already had plans with a friend that afternoon, and surprise! Her friend's another dude. Epic {{facepalm}}.

How is that a facepalm worthy moment?

ThisTroper and her then new boyfriend were in a school bus in 8th grade, about to kiss for the first time, and... His friend popped over the back of the seat. The boy was in the aisle side seat, and he jerked back, and ThisTroper ended up slamming into the window.

I loved doing this to my best friend and her now-ex. Whenever they were about to kiss before class, I would stand a foot away, not blinking with a wide, disturbing grin on my face. They really didn't appreciate that. Another time, I had my computer playing a romantic song and they were snuggling... and I promptly switched the song to Caramelldansen. Yes, I was a prick, and I enjoyed every second of it. And no, I was not the reason they broke up.

This troper and her first boyfriend never got past chaste kissing because of moments like these.

For some reason, every time this troper gets on the bus with the girl he likes, someone sits directly in front of them and butts into the conversation. Considering they could easily be mistaken for boyfriend and girlfriend, this really makes no sense other than GenreSavvy people being Jerk Asses or else just this troper's role as a CosmicPlaything.

My experience of this trope is a DoubleSubversion -- yeah, he and I had forgotten the existence of the rest of the world as we held a private and serious conversation, but it was in plain view of everyone because we were sitting in the school grounds. Despite all this, we managed to ignore my classmates shrieking from the third floor and carry out the conversation. The ''real'' MomentKiller came in the form of the school bus, which was a pity since I was supposed to go home at a much later time that day anyway. A RelationshipUpgrade ''did'' follow, though...

The girl I'm in love with has a ton of friends, who apparently love to come and greet her while we're talking.

This troper and his girlfriend cuddle a lot. More than kissing, more than talking, more than anything. Every time they do that at his house though, his dog runs into wherever they are, waving her stupid adorable tail around and jumps all over them into a near-death state.

I have witnessed two of them. 1: (non-romantic) One of my friends had one of those pairs of pants that rips when you yank them off, and she pulled them off (SHE HAD PANTS UNDERNEATH). But, they got stuck. Cue many a FacePalm. My response? "Way to kill a mood."

Second one. My friend and her boyfriend were watching some guys play basketball. Me and another friend looked at each other. #QUOTE# Me: Look at them all Romantic-y over there. #QUOTE# Friend: It's so cute... #QUOTE# Me: Let's go kill the mood! #QUOTE# Friend: NO! DON'T RUIN THIS FOR HER!

Of course, this didn't stop me. But then the bell rang.

I've had this happen to me, but now I'm usually the perpetrator. Examples include:

Being with my then-girlfriend in the janitor's room, hands in pants and all that. Enter the janitor.

A couple I know were in the car making out when it started raining. I just walked over and took a nap on the back seat, while they started making nervous small talk.

In the middle of the break-up talk with my last girlfriend, my phone rings. She had cheated on me and I was still pissed off, so I answered (classic MomentKiller). She was jealous enough to try oral sex to make me hang up.

Wait, ''what?''

Not a romantic example, but invoked by a Reese's Pieces of all things. My friend was eating candy and giving her standard I-Shall-Be-A-World-Dictator speech to us. #QUOTE# Friend: You will be defenseless against me! You shall soon feel the effects of me, and the bomb I implanted in your - *ACHKLACKLEACH*!

Implanted in your ''what'', exactly?

It says "In the ACHKLACKLEACH", though I don't know what that is...

This troper talked to his girlfriend about kissing her at a high school dance. Although this wouldn't be her first kiss, it would be his, and it would be their first kiss together. He spent the whole night not sure of how to go about it, then, as the night was approaching its end, he dragged her outside onto the front steps. Just as the door shut behind them, however, it opened again, and out stepped his little brother, who was following him simply because he had ''nothing better to do''. The couple broke up before they were ever able to kiss.

This troper had this happen on a recent school trip. She had been hanging out with a guy who she'd been in love with for several years. After noticing that he was paying quite a bit of attention to her, she decided to confess. As it turns out, he liked her too (but wasn't quite ready to date yet due to a recent breakup). They were standing outside of the hotel where their group was staying, and it seemed like something was going to happen... and naturally his mother, who was a chaperone, immediately opened the door and began talking to him, completely oblivious to what was going on.

This troper and her friends all are like this, shouting '''"GET SOME!"''' at the top of our lungs whenever one of our other friends is trying to 'get some'.

ThisTroper once handed a pencil to a girl who was making out with her boyfriend in middle school. (It was next to the lockers, and she looked rather uncomfortable being pinned against the wall.)

ThisTroper was hanging out with the girl she liked, and the girl felt the same way but was VERY shy. I finally got her to be relaxed, brushed the hair out of her eyes, and then leaned in for a kiss when "DINNER'S READY!!" happened. This troper was not amused.

A non-romantic example: A friend and I rented and viewed TheLionKing for old time's sake. I watched miserably while Simba tried to wake up his dead father. #QUOTE#Simba: HEEEEEELP! Somebody! #QUOTE#Me: *wipes eyes* #QUOTE#Friend: Agents are...... GO!!! #QUOTE#Me: *headdesk*

Something similar happened to this troper when her autistic little brother commented on the scene using a Winnie the Pooh comment he'd twisted up: "Poor Dad. He seems rather dead." My mother and I didn't even try to keep straight faces.

This troper's own body. Shots of random pain or sudden spasms (the latter of which are still to be medically explained) have all done their part to cause the cancellation of dates with her boyfriend, keep her from snuggling with her boyfriend, and keep her from snuggling with her boyfriend.

This Troper is SurroundedByIdiots, full time. I was trying to have some time alone with my crush, but as he is TheHero in our 8-man band, our friends ''just followed us around''. Nevermind the fact I had a Valentine's Day present in my hands and was trying to give it, but was too embarrassed to do it in public, and that ''99.9% of the guys already knew what I was trying to do, but followed us anyway''.

This is my speciality. Since I live with GlurgeAddict drama queens, it's not hard.

I admit to doing this to two people I know. But they act very mushy and someone needs to break it up

This Troper and his girlfriend were cuddling. Her little brother joined in.

This troper does it sometimes. Yet the best example that he ever saw was when a classmate of his was trying to flirt with a freshwoman (though off that party, they don't have the best of relationships)... and a classmate of hers broke the moment by talking about the sticker that came with her bubblegum!

Me and a group of friends were camping. We had a very big tent (and I do mean big. As in, made for 20 people, big), and at one point in the evening, it was practically abandoned as almost everyone was outside by the campfire. The only people in the tent were me, my almost-boyfriend... and another friend who apparently didn't realise that she was killing the moment. I have no idea how she didn't realise that, however, because ''everyone'' had known for ''months'' that we liked each other. Really, the RelationshipUpgrade was only a formality at that point. And it did happen about a month later, in a room full of people, no less.

This troper's friend was slow-dancing with the guy she liked, when they were distracted by another pair of friends (who were previously completely unattracted to each other) making out in the middle of the dance floor. Luckily, they recovered from the shock and kept dancing for quite some time after the song ended.

This troper is a dedicated student of the delicate art of Moment Assassination, but does usually knows where to draw the line. That said, it's still amusing to make sarcastic quips during emotional scenes in movies.

This troepr was listening to a beautiful Yiruma song (specifically ''Dreams'') on [=YouTube=]...and then her mom screamed at her to close the windows because it was raining.

This troper was at prom, slow-dancing to the last song of the night with his platonic best friend. It was great. It could have even been romantic, bar two things: Our conscious effort NOT to let it go that far and...the mutual (female) friend of ours who decided to latch on to us and remain there, a third wheel, for most of the song (after she had done similarly to a couple we all know).