I recently discovered these people through a comment section on Digg.com and I found their public Improv skits to be rather enjoyable.
One of their best is the Food Court
The best part is when the security guard shows.
High Five on Escalator
I need one of these. We all need a high five sometimes. I'd rather give a 'free' high five than a free hug. Make sure to read how this was done here. It is nice to see people's reactions to the whole thing.
I like these guys.