This may not be my dumbest moment, but I'm sure it ranks pretty high. When I was a young kid, we had a swimming pool. I used to swim just about every day after school. Well, one day I decided I'd take a basketball and hold it under water. It took just about all my weight to hold it 6" under the surface.
Now, I don't know why, but children seem to realize things are stupid after they've started them. I was no exception. I got the "bright" idea to release the ball and duck before it hit me.
That brings me to my next observation. Kids have no concept of how fast things move and the time it takes to get out of the way. In my mind I pictured myself ducking and the ball flying right past my head. I remember distinctly looking at the ball, staring it down, and then releasing it. Just as the ball began to slip past my palms, I heard a little voice whispering in the back of my head. "Hey doofus! This is not a good idea!" Of course, it was hard to hear that voice because of the Knight Rider theme song simultaneously playing in my head along with watching the Dukes of Hazard car make a heroic jump. And, come to think of it, I don't think the voice got the entire idea out. It was more like "Hey doofus! Thi. . .AH YOU STUPID JACKASS LOOK WHAT YOU'VE DONE NOW!"
Thankfully I have a very hard head and did not lose consciousness. I'm not sure my ego could have taken drowning myself in a wading pool with a basketball. I can, however, tell you first hand that holding a basketball under water and releasing it can cause a severe bloody nose.
So, what are your dumbest moments?