During veterinary school in Ames in 1996 or so, we were rushing to get out of the crowd after a Geoff Moore and the Distance concert, and did not recognize the band members. Yes, we had just experienced their awesome music for the preceeding two hours. We found the same back exit the band was using, and I was in tunnel-vision get-me-out-of-this-crowd mode.  

They said “Hi guys!” and, thinking they were other fans being friendly, we said “hi,” but did not stay to chat, which, in hindsight, was the chance of a lifetime. It was nice to meet you, guys.