From Kathleen:

I stumbled upon some links that are fun examples of performance art.
They're old videos so I'm pretty sure the class has seen some of these.

http://www.youtube.com/watch?v=jwMj3PJDxuo
http://www.youtube.com/watch?v=9MBBr-a2KnM

The Improv Everywhere YouTube channel has a bunch of other videos. These
were two of my favorites.