Let's see......
No, can't tell you about that. Or that one. Nope. Nope........OK, this one is OK.
On the track, district championships, third round of eliminations for sprints. Me and the other rider at the start line, we start, get the pushoff, I take one pedal stroke and my toe clip strap gets caught between the chain and the chainwheel. Down in a heap! The other rider is looking back over his shoulder with a WTF look on his face. (My old straps were worn out and too frayed to trust, so I put new ones in that morning, but didn't shorten them.) Restart. I won the heat, but only because the other guy was afraid to get too close to me!
The really embarrassing thing about it was I was feeling like a big swingin' something all week before that, really looking forward to the weekend, so I invited a bunch people to come and watch, and several actually showed up. That was in the late 80's and I'm still hearing crap about it.