Obviously, I'm opening myself up for ridicule here, but true story:
In the early part of the 00's, Justin Timberlake was dating Britney Spears and was a member of N'SYNC. I, was in grad school, and was waiting tables at PF Chang's in Memphis. One night, during the Christmas season, Justin Timberlake walks into the restaurant with a girl (some local skank. Obviously not Britney.) I was not a fan of N'SYNC, so I didn't really care, but have a niece who at the time was 9 years old, and was in love with them. Now, I am not famous myself, but I would like to think that I can at least understand what a celebrity is probably thinking when in public. They probably would love it if everyone left them alone. I get that. Had he not walked by me, I wouldn't have said anything at all, but I was standing by the bar cashing out, when he walks by on his way to the bathroom. I very quietly, where only he and I can hear, say "Listen man, I know that you probably don't want to be messed with right now, but I have a 9 year old niece who loves you, and if you could just sign something for her, she would love it." Nothing too major. And definitely not in a "OH MY GOD, EVERYONE LOOK IT'S JUSTIN TIMBERLAKE!!!!!" kinda way. His response is better demonstrated visually, but since we're on a message board here, I'll just have to describe it:
Imagine a flamboyant gay man (I'm not saying he is gay. Obviously, he has dated some real knockouts and is straight. Not saying that, just imagine a flamboyant gay man) throws up a facepalm 2 inches from your face. Then, makes a disgusted and exasperated noise. Then, walks a semicircle around you (all the while holding up the facepalm) and proceeds to the bathroom. If I wanted his autograph, it would have been one thing, but it was for my niece, which kinda made me a little angry.
The guy can dance. He's funny on SNL. But, the one time I was around him, he was a real cocksmoker.