I actually do bits of my writing in sort of incidental spaces - when I'm traveling on the Tube or on a bus. More often than not, it's a reaction to how you feel about something, and if you're sitting down and concentrating on, 'I must write something,' then you can't have a truthful reaction.
The thing I find really special in performance is that there is this slightly mystical thing that takes over when you're responding to a crowd and engaging in people's imaginations collectively in a room. I've always thought that one of the most incredible things about being alive is going to see some kind of performance like that.