Insofar as The Hand In Warm Water trick works at all depends on the power of suggestion--simply thinking about water, or in this case dreaming about it, makes you want to go to the bathroom.
The effectiveness of the stunt is a matter of debate. Some urologists scoff at the idea. But other medics have been known to tell patients having a tough time urinating after rectal surgery to put their hands in warm water.
Originally posted by ridcully
I don't know what actually causes it. Maybe an involuntary reaction, but here is a pic that seems to prove it true
Originally posted by asala
Guess the only way to know is if one of you test it,
Im sure you have a friend that could put your hand in the water while you sleep
Then you can come back and update us if this is true or not,
all in the name of research of course
Originally posted by greatpiino
No, it didn't work again. I'll try one last time next time I'm drunk, maybe I'll have a better shot then.