Heh, Mister Nightdog mentioned that too. That's another thing I love about them -- they don't edit out the people around them doing stuff like that. In their other videos there are little kids imitating them, and one where a woman moves a chair out of their way, and one in NYC where a passerby yells at them, and they keep it all in. I know it's mostly about them not breaking character, but I think there's also an element of love for the performance and the idea that other people are part of it.