Just a stupid gimmick where you can climb up really high, and jump off into a pool of water making gestures and noises on the way down.
I know I'm a bit late on this one but you can almost do that off the windmill at New Switzerland, not sure about in this VU but in a previous one it was not a good idea to hit the water in any position other than standing, if you did it was the big T to get out of it and sometimes a relog.
