I like the simplicity of the latest effort from Improv Everywhere that appeared to bring a smile to all the morning commuters in New York City: [youtube=http://www.youtube.com/watch?v=Abt8aAB-Dr0&fmt=18]
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Improv Everywhere
Improv Everywhere's latest stunt took place at JFK airport where their "agents" along with cooperative car drivers boisterously greeted with flowers, signs, and balloons randomly selected arriving travelers.
[vimeo http://vimeo.com/2268595]
Brilliant as always.
Improv Everywhere, the same people that brought you the recent "frozen in time" spectacle in Grand Central Terminal in New York City (which was rapidly copy-cat'ed around the world) staged a musical in a crowded food court at a mall in LA. Check out their website for other great past improv coups. Relatedly
An improv group at Columbia University years back did a similar thing, except instead of a mall, they used the obvious settings of Butler library (ahh, Butler how I don't miss the nasty smell of the 4th floor study room and your insanely crowds during midterms and finals) and a lecture.
[youtube=http://youtube.com/watch?v=3SwhzFsuvQc]
[youtube=http://youtube.com/watch?v=-mUyvaPtsJw]