I were big punk fans, and we knew GC's music and liked it. They opened at a show for another bigger band, and while the bigger band was playing they were just chilling in the crowd (this was before they had their 10 minutes of fame).
We ended up chatting and getting autographs from them for 20-30 minutes. Cool guys, and we ended up seeing them and hanging out a few times.
Months later I was on my mission, and some of my buddies and my brother were at Warped Tour in SLC. When GC came out on stage they said "Hey, where's Penske Material? He's always at these shows."