So a month or 2 ago Charlie and Jill started playing this really silly made up game. From what I gather by watching, Jill pokes her bum up like shown in the picture above, then Charlie slaps her bum and she falls down and they both laugh hysterically. Then, Charlie pokes his bum up and Jill does the same. I have been telling Dave about this game they made up for a while now, but he finally got to witness it himself and he couldn't resist joining in the fun. As dumb as the game is, it's cute to see them playing together.