Perhaps a better question is what is the closest you have gotten to someone famous?
I came across the cast from Disney's Sonny with a Chance at Disneyland one evening.
About a month later, my friend literally got punched out by a security guard for accidentally bumping into Selena Gomez who was with David Henrie (both, Wizards of Waverly Place) at Knott's Scary Farm at the same time as us. He's clumsy and wasn't watching where he was going, but how do you explain that to a security guard?
Dominic Monaghan (LoTR, Lost, Flash Forward) was in a restaurant that I go to all the time just the other day when I went for lunch.
I've been friends with USC Quarterback Matt Barkley for the last several years (same grade, same church). Long before he was popular. I was actually talking to him and his family this morning.
There's been some more too, but this is recent stuff. What about you guys?