When playing a game on a console and your stuck on a particular level, an feel you cant get any furthur, have an end of level wank and when you return, you should manage to complete that level effortlessly!
If one's bladder level is high, they have to pee. If it's low, then they don't have to go.
However, if one's bladder level is over 9000 then they are in dire need to go pee, or they are most likely dead due to pee replacing most of the very blood in their veins.