Logic, when you're 5

As I walked through the family room carrying a laundry basket, I saw Little Brother lying facedown on the floor, silently kicking his feet.

No, he was not having a temper tantrum (this time).

Adventure Boy was setting up a train track next to Little Brother. He looked up at me and declared, "Little Brother is a fish."

"Little Brother's a fish? Then why are you building a train track?"

The logical answer, of course: "Because it's his birthday!"

It's not Little Brother's birthday, of course. But nothing else about this conversation made sense either.