I met Nick Cave and Blixa Bargeld once after a Bad Seeds gig. My wife and I sat around on milk crates while Blixa poured us Bollinger into plastic cups. He was really friendly if a little quiet. Nick Cave told me off for not seeing more of his shows. I don't blame him! This was around the Let Love In era and they were absolutely incredible. It was a great night for us.
And I met Björk and Einar of the Sugarcubes after a gig too. We stayed drinking backstage with Einar until the wee hours when we got kicked out of the club. Really lovely, funny guy. I think he does movie and TV music in Iceland now - I've seen his name on a few Icelandic shows.
My only negative "famous people meetings" were with John Galliano, who was main designer at Dior for a long time (he was a bit of a wally) and Emmanuelle Beart (once stunningly beautiful French actress who was in a Mission Impossible film) who wouldn't keep her photoshoot date with me. I was shooting for a magazine, met her at a news conference and was supposed to shoot her later that day but she went all prima donna. Oh well, her loss!
Then there was the time Michael Jackson wanted to buy my photos of children... (true story!)