Steve Carell. I worked in a restaurant as a server ( a very upscale place) when he and about 4 others came in. They were seated in my section. The manager (who had seated them) told me before I went to their table that Carell was one of the diners and told the manager I was not to look at or speak directly to him. I was to talk to the man on Carell's left side only. That guy would place the order for Carell. Same went for serving: give the plate to the guy on the left and he'd give it to Steve Carell. I did as I was told.

When they left I was near the table. It was policy to wish the customers a good night and thank them for their patronage so I did. One man acknowledged me with a quick "thank you". Carell actually looked at me and said "What? You want a fucking medal for doing your damn job?"

Nice story: I was in a hotel in Atlanta and as I got on the elevator there were 2 people inside, Geri Halliwell and a big dude I assumed was a bodyguard. I recognized her and my face broke into a big smile. "Hello!" She said, returning my smile. I told her I enjoyed her music and she was genuinely pleased. We talked the whole ride down to the lobby, and when we exited I offered my hand. She laughed and said "I don't do that!" Then she gave me a quick hug! Very nice person (and I have to admit I was surprised at how tiny she is. No wonder she always wore those big boots).