During nap time when they weren't supposed to be playing together, Jonah was in Trey's room and they were playing with Trey's money. Jonah threw a quarter up in the air, caught it in his mouth, and down it went (or so the story goes). He said it went all the down and was breathing fine, but I took him to the ER anyway for an X-ray. And yep - it's in his belly! So now we just wait for it to pass.
He loved the ER, unfortunately. There were toys in the room, they pushed him to the X-ray room in a wheelchair, and he thought the X-ray machine was cool. Not the deterrent I was hoping for.