Have you guys heard of Improv Everywhere ("We Cause Scenes")? It's an improv group based mostly in NYC and run by a guy named Charlie Todd, that does various improv "missions" in public spaces. Pretty much all of their missions are either heartwarming or hilarious or both, and they're *all* fun to read about, but there are a few that are particularly fun to watch on video. My favorite ones are below. Check them out!
Frozen Grand Central Megastore Food Court Musical The Mp3 Experiment Four No Shirts Human Mirror Look Up More Guerrilla Handbell Strikeforce The Camera Flash Experiment I Love Lunch! The Musical Invisible Dogs Who You Gonna Call? Aaaaand, that's all, folks!