Walking down the sidewalk, listening to "Go Go Gadget Gospel" by Gnarls Barkley (love that song), I start getting into it, shufflin' my feet and whatnot. I reach these stone stairs heading down, and decide, "Hey, I'm feeling it! I'll just jump down them!"
Jumped, didn't stick the landing, fell and sprained my wrist. Six people saw me do this, and no one stopped to help...or even stopped to laugh at me. Kinda weird. Then again, I DID just attempt to jump down a small stairway and failed, so...
Considering I ended up going to a bone doctor (forget the actual title) to get a brace for it, I'd say that was the most stupid injury I ever gave myself. I mean, I hurt myself a lot 'cause I'm kinda clumsy, but THAT was just special.