This guy is Jeremy Fry.  During a Celtics basketball game, the camera was panning through the audience while Bon Jovi's "Living on a Prayer" was playing.  At first, it looks like this guy couldn't care less about what is going on around him, but then the music picks up and so does he.  

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He's not one to just dance in place or wave to the camera either.  He gets up and really gets into it and gets other people in the audience to get in the groove too.