Long story short.... I love photographing improv, these people constantly blow my mind with what they come up with. I had to put together a bit of blurb about improv photography and it goes a bit like this...

"To explain improv photography, one must first explain improv theatre. These performances are totally live, unrehearsed, unscripted and, at times, joyously haphazard. Scenes can be as little as 30 seconds long, performances can unfold over hours, days even. Put simply, there are no second chances. The perfect shot is grabbed, not staged. Every image is unique, it will never happen again, you cannot ask the performance to wait whilst you change cameras, lenses or your position. A performer may be horribly unlit or another may walk in front of your subject at exactly the wrong time. As a photographer you have to be completely prepared both artistically and technically, then you have to read the performance, breathe with the performers and know what will happen before anyone else does.
I photograph this kind of theatre not in spite of these "difficulties" but because of them."