Michael Schenker. For me it was a big deal because I had been a ridiculous fan since I was 15. Of course it turns out he was hammered and went on stage after and couldn't play and walked off half way through Into the Arena and packed it in for the night. Not a people person...... That was pretty much the point where I was done with the meeting famous people thing. Since then i have had opportunities to go back stage and see aerosmith, the eagles, and some others, and i have always let somebody else go. I have seen schenker play quite a few times since, sometimes with only 100-200 people there and i love the show and skip the meet and greet.
I would love to meet mccartney though if i ever got the chance....