Unfortunately, I have a few situations to pick from.
I bowl in South Florida and it gets pretty hot and humid in the summer. I was bowling in a Friday fun league when the following happened. End of the third game, several Coronas consumed, not bowling great, stone 7-10 split first ball in the tenth. I decide I'm gonna chuck the ball down the lane as hard as I can. Problem is that my thumb stuck and the ball went straight up, through the ceiling tiles, hit the fire sprinkler pipe, back through another ceiling tile, and as I try to balance myself the ball misses my head by 6 inches. Definitely the most embarrassing moment on the lanes.
Dumbest moment was when I lost my temper, punched a carpet covered concrete wall, fractured two bones and completely tore two ligaments in my wrist. Two surgeries, no bowling for almost a year, and a permanent 15% range of motion & grip strength loss.