Confusingly there are two World Championships.
The World Stone Skimming Championships take place in September on Easdale Island, Argyll. The main rule is that the stone (Easdale slate only is used) must be no more than three inches in diameter and must bounce off the water at least three times. The longest skim wins. The current world record is 63m.
In the US the World Stone Skipping Championships are organized by NASSA (bringing stone skipping into the space age) and here the distance traveled over the water is irrelevant, rather it is the number of skips made by the stone that counts. The current world record stands at a staggering 40!
As the NASSA website says, “NASSA promotes stone skipping as both a ‘natural’ non-competitive recreation and an internationally standardized competitive sport… a uniquely ancient activity that touches something very special in those participating”
weird web: world stone skimming championships
weird web: NASSA
weird web: video of the world record 40 skips on 'strange games the video'
strange games no:119