They shouldn't call that a prank. That's something else. Something very special.
I've always wanted to install a tap where the water gun thing is on the left side of my kitchen sink.
I'm actually in the process of putting a tap in the place of one of those stupid soap dispensers next to the sink. I'll have a kegerator in the crawlspace, run the beer line up the cold water line to keep beer cold, and insulate it with some foam. Changing the keg will be a pain, but since I usually only run 5 gal kegs, it shouldn't be too bad.