one time I was working on my camaro and I left a 5/8 combination wrench on the fender. I then slid under the car on my back and I guess I pulled the fender cover a little bit and the wrench fell off and landed directly on my junk. as if that wasnt bad enough, I quick jerked my head up and smashed it on the front sub frame. That pissed me off so I punched the uderside of the floor board. I must have punched something sharp, because I put a nice gash in my knuckle. I then got out from under the car and threw the wrench as hard as I could, while screaming with rage, across the street. I calmed down a little bit later and went to look for the wrench, but it was in the woods and i never found it.
There have been other things that were MUCH dumber than that, but I think I blocked them from my memory