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I don't know what this sport is called, but it looks fun
(i.imgur.com)
General rules:
Exceptions may be made at the discretion of the mods.
It's pretty obvious. They're playing hopscotch on a vinyl mat covered with soapy water well trying not to spill a bowl of more soapy water. I don't see any bottles but beer may be involved. If it doesn't have a name, then I hereby dub it Slippyscotch.