Last winter, while in jtree- I was belaying a friend when I was overwelmed with the urge. I clenched my cheeks waiting for him to reach the belay. Finally, I ran around the corner, dropped my harness and pants, and began to let loose from both ends. Relieved, I pulled myself together and tied in. I got about 1/4 up the pitch when I reached around to chalk up- to my horror, my chalk bag was filled to the rim with urine!