It just worsens everything for this Troper. It just doesn't work even if you quote Jamil.

After a particularly vicious round of paintball this troper's friend was rather stunned so that left it up to me to apply a GendoSmack and the titular line to snap him out of it.

This troper tried putting this to use on a friend of his that was having a pretty bad day. Finding his brooding insufferable, This troper preceded to punch him in the face. His friend, in turn, viciously retaliated. This result was intended.

I've had it successfully used on me once. I freeze up in heights, and my friends couldn't talk me down. Eventually, one of them rolled up her sleeves, climbed up after me, and slapped me. Hard. It's lucky she did, because I would probably still be stuck up there if she hadn't.

This Troper had a friend undergo a rather shocking experience. In an effort to stop his babbling, he said the phrase above and slapped him. This Troper is not sure what happened next, but the nurses were very nice.

This troper does these to his friends by facing them and grabbing their shoulders whether they need it or not...>:)

This Tropette is prone to panic attacks and happened to have one when being at friend's house. She didn't know how to react to it and what to do. She didn't give me paper bag, nor did she seat me down, but gave me a really hard slap. It seized the panic attack just as planned.

When this troper found himself part of three man team for filming, writing and directing while he was merely an amateur. So imagine his shock when he got a call from the person 'in charge' that they were pulling the plug. This troper proceeded to verbally bitch slap the both of them over the phone and resolved the situation (Sidenote, one of them was trained in negotiation).

This Troper does this to himself. It works.

This troper was laughing hysterically, and someone slapped her. She stopped...and then ran out of the room crying, because she was in hysterics. Amusingly enough, she ''does'' do this to herself sometimes, but the point is that the slap pushes her over the edge and makes her cry/scream/generally freak out. And then it's out of her system.

This troper has (had?) a bad tendency to get hysterical due to overthinking. She had to be slapped out of one these. The friend doing the slapping was arguably more traumatised by it than I was. The reason she even did it was because she was afraid I'd start hyperventilating and she didn't have a clue on how to calm me down.

In the sixth grade, this troper's entire class went on a camping trip deep in the woods. Due to a wacky misunderstanding, about 13 of us ended up lost without supervision for what was probably about 3 hours. For the most part, we were able to keep our heads, but this troper was going through a phase where she was completely insufferable and a total drama queen. After about 15 minutes, she went into hysterics thinking she'd be eaten by a bear or something like that. Cue her best friend slapping her hard across the face and telling her to get a hold of herself. She did, and we were eventually rescued.

This troper is planning a little mental exercise - the plan is that should he catch himself angsting over very minor things, he should imagine Shinji Ikari coming onto the scene and giving him a PimpSlap, saying GetAHoldOfYourselfMan. This troper's intent is to embarrass himself into, well, pulling himself together, considering Shinji Ikari seems to be very much the EmoTeen (except in Master Ikari's case it's a JustifiedTrope whereas for this troper it usually isn't, though full-scale Shinji-would-be-embarrassed meltdowns and such over trifling matters are much rarer now as this troper is getting older...)

When this tropette's (male) friend was obsessing over her female friend's quasi-relationship with a guy he disliked (the first friend had a badly-disguised crush on the female friend) this troper told him this. Her point was proved when five other friends present agreed emphatically.

I'm usually the one to tell folks to get a hold of themselves. Fun fact: if someone blocks my two slap attempts, i ''headbutt'' the sap, which usually gets him/her back to his/her senses.

This troper did it once to a friend of his to wake him up. Completely unexpected, and it worked.