I've had a few.
My best is I used to do the website for Alex Lifeson's bar (The Orbit Room) in Toronto in 1999-2000. When Alex would show up (once every two to three weeks), he would always get there early and bartend for a couple of hours. One night I got there early myself, and Alex was behind the bar. He sees me enter, and says "Hey Hoffman, come here!" I walk up to the bar, he pours two shots of Tequila, and simply says "Drink". I reply, "Alex, that ***** will kill me". He then leans towards me to where his face is about 3 inches away from mine and says "Then you can tell all your friends you died drinking with the guitarist of Rush! Drink!" So I had the shot.
Later in 2000 I moved to California and my ex and I won a contest to have breakfast with Geddy Lee. There were a total of 20 people there. Everyone asked Geddy about Rush, and he was so nice to answer every question. My ex and I started talking to him about kids and baseball, and he literally shut everyone else out and focused on us for a solid 30 minutes, talking about kids and baseball.
in 2001 I was in LA meeting with Rush's security lead. He tells us to go to this laundrymat in East Hollywood and look for a big guy. Sure enough, my ex and I get to the laundrymat, and there is this mountain of a man standing at a door next to the laundrymat. We ask for Michael (Rush's security lead), and he says "He's right inside", and ushers us in. It was one of those true Hollywood hidden bars. I'm talking with 4 guys, nice conversation. Michael comes over and says, "so you're getting along with Limp Bizkit?"