Not one at Disney, but another park when I was a kid. I was on one of those motorized bumper boats and it malfunctioned and I couldn't stop it when it was time to come back in. So, I went in and it BOUNCED off and went back out. It took 20 minutes of stares from EVERYONE in line and staff had to come out to get me as I was going in circles in the middle of the pond area and they had to hop on and take me in. I laugh about it now, but my mother and I were mortified lol. I can still feel the eyes on me...soooo many eyes.
Though I did get attacked by seagulls at Disney and Sea World, but the one at Sea World was a little more pushy and stole my ice cream cone. At Disney it swooped down and tried to take my goofy hat (was too heavy though) heh. I was running around swatting the air, maybe that was embarrassing hehe though it wasn't on my list of embarrassing moments.