Now I want to force myself to go urinate...
Okay, we'll sit here and wait for you. Make sure your aim is good! :P
You better not stand!
Not necessary. Just make sure that, if you are going to drink large amounts of liquid, that you drink beer!
I keep thinking of that part of "The Right Stuff" where Alan Shepherd, in the Mercury 7 capsule awaiting liftoff, asks for permission to urinate. Permission denied but that didn't stop Shepherd from doing his thing.