How come if your fingers touch warm water while you're sleeping, you pee yourself?

Question

I've heard many times that a good prank is, "When they're sleeping, put a bowl of warm water and put their fingers into it. He will pee himself."

What is the reasoning behind it? What does warm water do to make the person urinate?

Answer 1

This can be experimented by the questioner himself, however he/she can share the results, if true, then, this becomes a valid question.

Answer 2

--» Haha, I heard that a lot of times on television, Y!A, online, ect. too! I don`t think it`s really true though. Just because your fingers touch water, you pee. Doesn`t seem very realistic. =P

Answer 3

agree with Georgi.

♥♥♥, let us know how it works out. And remember, to be truly scientific you will have to repeat the experiment many times.