• Walter Koenig (Chekov) - my first Star Trek convention in 1989, had a really nice conversation with me and my mom. well, my mom.
• Adam Duritz - kind of almost could have tripped over me after a concert in 1994
• Stuart from Belle & Sebastian - some people gave us their backstage passes after a concert in like 2007 and we got autographs. I didn't manage to make any human noises but I did refrain from drooling.
• I got bored once and photoshopped (do you still call it that if you're using Paint?) my friend into a picture of John Barrowman and a Dalek. Last week another friend printed it out and brought it to a con. so John Barrowman touched my crappy photoshop job, laughed and signed it. this is one of the proudest moments of my life.

I guess watching porn in the same room as Dan Savage doesn't count since that happens every year.