OK, well, my first embarrassing moment was when I was 10 years old.
I couldn't sleep that night and I was anxious waiting for Santa. Later that night I heard the door open, my mom was still finishing up the decorations when I saw my dad rushing though the door carrying quite a few toys, but the biggest and most visible was a doll which I had asked Santa to get me for Christmas. I was shocked seeing my dad carrying all those toys. I realized then that my dad was Santa, I felt so bad, yet I couldn't say anything because no one saw me hiding trying to find out who was at the door. I went back to bed feeling bad, and I could hear them wrapping the presents. Well, I never told my dad I saw him.