Where do you ride?

OK so we were sitting at lunch at my parents' house and all of a sudden Layton blurts out, "I ride in the log." My parents question him with what log? where? when? and so on... Then I had to explain what he meant! Layton asks a lot if he can ride in the seat BESIDE his carseat instead of IN his carseat. My response is always, "No, you have to ride in your carseat; that's the law!" BUT going to my parents' house, I don't make him ride in his carseat since we don't have to get on the road soooo...he says that he rides in the log.