there are many funny things i can think of, like the time my brother was driving and we were at a red light and he pulled a retarded face at the old man in the car next to us, the guy looked so freaked out!
another would be what just happened, on facebook i have many Queen photo albums, but since i acidently uploaded a picture of my grandad sleeping with a crisp on his head (chris and i got bored) and people asked "is that roger? OMG!" because my grandad and white hair and a wee white beard. it was hilaruous! xD