Background knowledge: Sky runs into a lot of things thus causing him to fall down to the ground. He also gets knocked down by the dogs or his brother often.
During diaper changes, I have been playing the "where's your..?" game with Skyler. He gets the nose and the toes and the belly, but when I ask him where his head is, he points and says, "Bonk".
He doesn't have a head, he has a bonk.