When things go wrong in life, it's important that it's bad enough so you can learn your lessons. (After all, how else will you know not to do those things ever again?) For these people, after trying to do these spectacularly stupid things they were lucky enough to get an immediate lesson. These were quick, painful... and absolutely hilarious. Thankfully, no one was seriously hurt (except their pride, their pride was definitely hurt).
1.) He had to know this was going to happen.
2.) Trust falls are for losers.
3.) It seemed like a good idea, sort of?
4.) NEVER FEED THE SQUIRRELS.
5.) The sport isn't dangerous. Filming it is.
6.) How did anyone agree to this?
7.) Why yes, you SHOULD practice volleyball indoors.
8.) If it seems too good to be true... it is.
9.) Fitting into a locker is cute.
10.) Being polite is for suckers.
11.) Ugh, white trash.
12.) "Thanks!" -The Internet
13.) Instant karma is the sweetest karma.
14.) I feel like they should have seen this coming.
15.) Don't attack innocent signs. They'll murder you.
16.) These guys are totally going to get chicks.
17.) Adults: don't attempt to use swing sets.
18.) No, no, you need to put the power setting to "Low."
20.) This could have gone well.
21.) People are serious about Twilight books on loan.
(H/T BuzzFeed) Can you say OUCH? (And also LOL?) These are the kinds of lessons that you will remember forever. ... we're pretty sure they won't be forgetting this, either.