I feel always amazed by the guys who climb at the roof in a Stones show.

First, I cannot stand the heights.

Second, I wonder what they do if they need to pee. Waiting the encore?
Or maybe they just have a little leak on the crowd, and nobdoy notices.

Well, you just kind of watch your liquid intake and "go" just before you go up to your position. If it's a very long show and there are no breaks, an empty quart Gatorade bottle works in a pinch.