I was one of the lucky callers to a radio station and got tickets to the Red Hot Chile Peppers when Dave Navarro was in the band. Got to meet them backstage.
Flea never showed up. The drummer was quiet, but not rude in any way. Anthony Kiedis was a jerk...he complained about having to take time for us while preparing for a show. But he still made time to hit on the 16 year old girl next to me.
Dave Navarro was really, really cool. Appreciated us, signed everything, great guy. The kind of guy who has a lot of success with women but you don't begrudge him for it.
I also went to a Dark Tranquility show, and the lead singer (Michael Stanne) was hanging out having a drink after the headliner finished. What an awesome guy; completely down to earth, realy appreciated and was friendly to the fans, and a genuine pleasure to meet. While not a big celebrity, that was also a huge treat as I'm a dedicated fan of the band.
Neil Young goes to Sharks hockey games a lot, I sat near but never met him. He eyed me suspiciously when I glanced over.
Oh, saved the longest encounter for last. I met Yau-Man, one of the top four in this last Survivor season and one of the most popular contestants ever. He went to college with my co-worker, and we had a fun get together at her home one night with a bunch of other people. I talked to him for over an hour, getting all the Survivor gossip and his insights. Played board games later with his wife and kid, kind of a surreal experience. He's just like on the show, a good guy who enjoyed the celebrity of being in the public eye and is extremely sharp. He probably answered the same questions he's been asked a million times, but was very patient and pleasant. I liked him and his family a lot.