OKW has a waterslide opening ceremony. The lifeguards pick out a kid and ask them to "officiate" at the starting of the waterslide. The kid makes up a "magic word," and at precisely the right moment, they say the word and the water somehow starts flowing in the slide. (There may be some connection between the water flow and another lifeguard turning the pump on.)
DD got selected to do that on our last OKW trip (Nov 06) and she still talks about it occasionally. She still has her "magic wand."