Edit: I still object to people pi**ing themselves in the foam though - if you're going to do it, do it with style - like off a balcony or something!
Since when do people pee themselves in the foam?
Having said that, at Reading I was right at the front during Audio Bullies and Lemon Jelly, and so instead of walking to the toilet I found a beer cup and peed in that, and tipped it out on the floor. It was quite a liberating experience to be honest.