Performance artist groups who use the element of surprise:
1) my ALL TIME FAVORITE GROUP: Prangstgrup. This is a guerilla-style theater group from Columbia University. They have done some excellent staged work with hidden cameras. Please look at the Archived Videos and watch “Subway Lecture” (above) features over-specialized academes giving lectures(with handouts!) to strangers on the train. “Library Musical” is also great. http://www.prangstgrup.com/index_1000.html Oh, and “Silent Dance Party”. They take forever to load but it’s worth it.
2) SF0 (more about this soon)