Well, there was the time at a horse show when I told Peter the guy we were watching rode almost as well as he thought he did, and the person sitting next to me was his mother . . . Oh, you wanted diving-related.
The usual -- Getting in the water with drysuit unzipped. RUNNING the head-to-toe equipment check the other night, and despite that, swimming out a couple hundred feet and discovering I didn't have my weight belt on. Doing an ascent which was utterly perfect in terms of team positioning, timing and stops, but ended up a hundred yards from the boat because we lost the upline. Getting to do a dive with an instructor I really wanted to dive with, only to lose all buoyancy control during a no-mask ascent and cork. Lots of little stuff.
What was fun was having dinner the other night with the person who was my buddy during the worst dive of my career so far, the one where I humiliated myself to the point that I don't like to think about it, and discovering he couldn't remember the dive . . . Yes!