You've done it at some point. Admit it.

My brother and his friend (both 16) were hanging out in the garage and decided to play with some spray paint (it was the friend's idea). They decided to paint one of the bicycles in there for fun. Did they pick my brother's bike? An the broken one we were going to throw out? No! They picked my dad's vintage 1970's Schwin Racing Bike (worth at least $500 now, he got it for free). They painted the whole thing black and made it practically worthless. My dad and uncle (who got the bike from work back when it was new) took it well, but have made my brother promise to stick to painting his own stuff.

I once, while sitting in the car while my dad went in the store to get something, had the screen saver turn on in my brain and proceeded to stick a paper clip in the ignition of my dad's car (possibly acceptible for a child, not so much so for a 19 year old who is usually too smart to do such things). The second I realized the clip was stuck my brain woke up and I began trying to get it out (with little success). My dad got back to the car and asked what I was thinking (I told him I wasn't, which seemed to make him less pissed). Luckily my brother (who wants to work on cars for a living and is thus pretty good with this stuff) was there to fix it. For my stupidity I got a pretty deep cut on my index finger and had to go in the store to get a paper towel (which kept me out of the way I guess).

In my history class last year, my teacher said that we were going to be moving on to study the Holocaust and he asked if any of us knew what Kristallnacht was. This Jewish troper's classmate said, "Yeah, that's a Jewish holiday, right?" It could have been an honest mistake but we literally five minutes earlier watched a movie that EXPLAINED IN DETAIL what Kristallnacht was.

Your then-fellow classmate had better be glad he wasn't in Israel then, he might have been TooDumbToLive. However this non-Jewish but possibly Eurasian-from-way-back-in-the-gold-rush-in-Australia-but-likely-not-counting-even-if-true-but-oh-well-never-mind troper is appalled at that aforementioned former classmate being a complete, unmitigated and comprehensive dumbass...

Just a couple of days ago this troper got sent to the office for insubordination. for failing to comply with a request he knew was completely reasonable. He spent most of the rest of the day trying to figure out WHY he did that.

This troper stuck a spherical (so I guess it could be a literal Idiot Ball) bead up his nose in elementary school. It was stuck there for about a week. He didn't tell anyone about it.

This troper did the same thing. To make matters worse he then did it again. Twice. It helps that he was about 7 but still, come on Past Me.

We had an idiot ball in form of a tree's root ball in our back yard. Because the things died, mom dug them up, and dragged one nice dripping muddy ball ''through the house''.