Here's my crowd story.
Standing in front of me were the prototypical DC couple....30something guy with glasses and nerd haircut, with younger (?), hotter, blonder girlfriend (wife?). Guy is sort of laid back and bobbing his head, girl is flailing wildly...screaming all the lyrics dance/acting all the songs with her hand, arm, and facial gestures, often with hands flailing wildly. You know the type. Heck, maybe it was even someone reading this.
Next thing I know, the guy is down on the ground looking for his glasses. I can't say that I saw how they departed his face, but I have a pretty good guess. Within a few seconds, a half dozen plus of us are trying to help the poor guy find his glasses before they get trampled. And voila, in a stroke of good fortune, a short white guy in a white shirt (I know this describes most DC men but that's the best description I have, and no it wasn't me, I swear) comes up with the glasses for the buzzer beater win.
My immediate thought was if I were the nerd who lost his glasses, I'd immediately head to the bar and buy the white guy a crappy thank you beer. And much to my relief, within a couple of minutes, the nerd made a run for the bar. He came back with three plastic bottles of (ICE COLD!) Miller Lite (or whatever it was). He handed one to his hot girlfriend to use as a dance prop, one to another friend, and the third...well he kept that one for himself. Then he plopped himself about a foot in front of the short, white shirt guy who found his glasses. I tell ya, it doesn't get much more DC concert crowd than that.