OK, I'll throw mine in. Not bike-related, but still stoopid. Many years ago, I was taking a friend and a a couple of girls out on our motorboat over spring break. Being cool to impress the girls, I backed the trailer in, launched the boat, and putted around to the dock before I realized that I forgot to put in the drain plug. Then, it took what seemed like ten frantic minutes for me to actually find the plug. Just about sank my dad's boat that day...and never saw the girls again.
Will