A few weeks ago, Jo farted. Oliver laughed, and then he said to me, "Oliver gets to say play food processor, Mom gets to sing, and Jo gets to fart."
Weird and funny, but what's weirder is that he's said that exact phrase about half a dozen times since then! I asked Andrew if he'd taught him to say that, but he hadn't.
So, now, every time Jo farts, Oliver explains to us that he gets to play the food processor, I get to sing, and Jo gets to fart.