You'd be surprised how often things like that occur. The whole being smart while being idiotic at the same time thing.
6 year old me: Let's dance on the lightpole that mom's said hundreds of times not to do! *falls* Oh, hey, look, there's a laceration on my leg, almost from ankle to knee. And I see white at the bottom of the cut. *doesn't even go to the hospital - bandaids and bandages are totally all that's needed for a cut like that from a rusty metal thing.* *2 weeks later dancing on the lightpole again*
7 year old me: The neighborhood cat is really really mean. Let's throw it to teach it a lesson! And to see if cats really do land on their feet all the time. *throws cat. Cat attacks and it ain't pretty.*
14 year old me: Wonder if this bouncy ball is as bouncy as it's advertised. *bounces it in the house, and it breaks a painted plate made by my sister several years ago.*