Yep, it's that old thing where an indie rocker type does a bit of crowd surfing only to find himself refused access back to the stage by security guards unaware what the guitarist of the band their safeguarding actually looks like. It could happen to anyone. It happened most recently to The Cribs' Ryan Jarman at Sheffield University, where security didn't recognise him after he made his way back to the stage after a stage dive. Amusingly it is all captured, more or less, on this YouTube posted video. I should offer a strobe lighting warning before you go look at it. Oh, and don't go look if you're sensitive about guitar abuse.
http://www.youtube.com/watch?v=_JsVVad-w1g
This was an eventful gig because, as you'll remember, Ryan's brother and bandmate Gary was rushed to hospital shortly after it with blood poisoning. Not that Gary's blood poisoning makes as good an 'and finally' story than Ryan's stage diving problems. Perhaps I should have structured this story differently.