i walked into th wrong class, sat down, actually thought i was in the right class, turned to talk to the person next to me, thinking its my mate and low and behold, its a tiny little kid in his first year, while im in my last year, and i look at him, look around the class, and i just said "what the fuck" stood up, looked at the teacher, and walked off.
and theres also when i was walking along, i turn around for a second and walk backwards, i think i was talking to someone behind me, i turn around and i smash straight into a little first year, who falls over and his head slams right into head teachers nuts, i was laughing so bad, the head teacher helps this little kid up who looks at him and runs off, i just stood laughing.
Not really embarrasing either but funny