Not sure if this qualifies as my most embarrassing moment, but it sure ranks among the top.
I was in school and the girl I was sitting next to either hit me with a ruler or scolded me. And I started crying. I wasn't wailing or anything, but it was obvious enough for the teacher, in front of the whole class, to ask me to switch seats with another guy.
I don't know what is more embarrassing, the fact that I was crying, or that I was bullied by a girl. It has been many years but I still remember her name. It's funny how you can remember such details.
Anyway, I was lucky that it happened when I was just 7 or 8 years old, or I would have been traumatized for life. :)