Most Stupid thing ive ever done.. hmm.. theres so many.. (that in itself is sad) I would probably say the most stupid recently was..
OH! Going on My Jetski about 55 miles per hour, then doing a quick u-turn on a river, then skipping over the water like a flat rock for 20 feet and missing a peer stopping an inch infront of it!
That could have ended up nasty.
Then swimming back to my jetski, up the current, that was a very strong current lol