The ones I remember:

Nick Cage at East Bay Vivarium in Berkeley. I was buying poison dart frogs, he was buying some spiders. Chatted briefly about our respective animals.

Lisa Marie Presley outside the same store. Not as nice.

Carlos Santana at a used record store in Sebastopol. Super nice.

Guy Fieri at his restaurant in Santa Rosa. It was part of a marketing class project in 1999. He was an ass.

Fred Durst at Magic Mountain. Total asshole.

Magic Johnson at Magic Mountain. Very nice.

Neil McDonough as he was entering the Coronet in West Hollywood and I was leaving. I had been drinking heavily and puked on his shoes. Sorry. I was the asshole.

Eddie Murphy at Great America while he was filming Beverly Hills Cop 3. Screamed at us when we said hello.

George lucas during the same movie shoot. Cool guy.

Never really geeked out on any of them. Didnt ask for pictures, autographs, etc...

Forgot the absolute best one:

Ran into Amy Lee (singer for Evanescence) right before they exploded with 'My Immortal' in Reno. Tried to hot on her, and kept calling her band Effervescence.

Yes I was incredibly drunk. I got nowhere.