Well, Improv Everywhere enacted this concept in real life NYC. Check out improveverywhere.com for the fantastic video (and a full report of the creation process), featuring Todd & Adam Stone ’05 (above, foreground) as well as other seriously awesome twins.
Speaking of the Stones (comedian duo, on this season’s Last Comic Standing), go to their website for some more of their videos.
 Video of said experiment:
Thanks to both Liz & Rachel for the tip!