Things I have learnt from extensive watching of Fail videos:
1) Parkour is waaaaaay harder than it looks
2) no one can ever land a backflip. Especially when drunk.
3) attempts to ride any rail with a skateboard/bike/unicycle/rollerblades/scooter will result in a swift blow to the testiculae.
4) girls attempting “sexy” dances at home will grievously injure themselves and/or others, usually with furniture.
5) cutting down trees should be left to professionals.
6) pranks involving fire never end well.
7) even if you’ve just fallen two hundred foot onto some spiky railings, someone will still say “You alright dude?”