Think about waterfalls
First you have a trickling stream, pittering down the mountainside, slapping lightly on rocks. After a few tinkling streams come together you will have a lovely, clear, swooshing river. Eventually this comes to a steep drop where it will gush over the top, splashing on the cliff behind it until falling into the churning pool at the bottom.

Alternatively, you could just clamp your urethra until you get urine backing up to your kidneys and you go into toxic shock.
( clockworkrat has nice pants, Fri 10 Jun 2011, 2:54, archived)