Having worked at a few awards shows here and there, I've met Tarantino, Uma, Shyamalan, John Cameron Mitchell, Altman, Harvey Keitel, Jane Campion, Peter Fonda, Garry Shandling, etc. So I won't count them. Though I saw Susan Sarandon and Catherine Deneuve talking after one of these shows and I was watching them, thinking "This is so cool. When am I going to see that again?"
Then I saw Tony Scott's The Hunger.
But the only time I actually went up to a famous person and asked for an autograph was at the Disney Pocahontas premiere in Central Park. I met Francis Ford Coppola, who was a very nice guy and I'd like to think impressed that someone as young as myself (I was 17) would recognize him. I just remember thinking, "I'm talking to the man who made Apocalypse Now."