The time you just HAVE to go and take a pis, after delaying it for a long time because you were doing something important.
At the wilting point its easy to get injured since you run fast towards the toilet with your hands on your crotch and your eyes at the floor. Many people at the wilting point have broken a toe as they hit an oven or something on their way to the toilet
"this movie is damn good, but I really have to pis...but I can't go now or I'll miss the cool scene"
*15 minutes later*
"SHIT! WILTING POINT! *run*"