Improv Everywhere are a group dedicated to creating live unexpected theater in public places. Their latest "performance", in the mens' room of the McDonalds on Broadway is clearly a work of genius.
Check out the "Best Gig Ever" description too. A large group attended a gig for a no-name band and spent the entire show acting like they were the world's biggest Bono fans at an unannounced U2 show. They'd even downloaded the band's MP3s in advance from their website, and learned all the words so they could sing along. Man, I wish I'd been there to see the lead singer step up to the mic and declare it their "best gig ever".
(I'm cracking up here)
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Funny coincidence. I just participated in an IE mission where in fact the mission was to be overheard in the Penn Station talking about the unannounced U2 concert (a pre-show that they were playing before their Madison Square Garden show on Saturday) that we just heard about, and then to run, leading people to the sidewalk across from a particular rooftop, where, sure enough, there was a U2 cover band on top fronted by a Bono impressionist. They played for more than half an hour before the police shut it down.