The kids are playing an imaginary card game in the pool called Got Your Wish where the cards are only visible underwater, and are guts, fish, 33's, rocket fuel, apples, and couscous. But no privates. But belly buttons. Actually, a hundred things on the whole world. And the cards are SUPPOSED to be green. Oh, and synchronized splashing is shuffling and dealing the cards. So randomly they all stop together and splash frantically, then stop splashing and resume playing. I <3 my creepy little weirdos.