Most embarrassing moment(s). Spill.
The only "embarrassing" moment I can think of is from when I was in Jr. High. Construction for the new school had started in the middle of the school year, and for gym we had to go to an off-campus field for outdoor softball.
I think it might have rained the previous night because the grass was slippery when we were at the field.
When it was my turn at bat, I had hit the ball and was running to first base. I had slipped and fell on my way to the base, and felt really embarrassed about it.
No one said anything about it, but I'm not sure if anyone noticed. They probably figured I meant to do it.