Maybe it’s a mail bus…

It was bedtime last night, and Simon needed to get his diaper changed and don his pajamas. After much cajoling he came over to our designated diaper-changing-and-pajama-donning area, but he brought his school bus. He drove the bus over to me and said “poopie” from which I inferred that he wanted me to change its diaper. After confirming my understanding of the situation, I informed Simon that the school bus did not have nor did it need a diaper. Simon pulled down the back door on the bus and indicated that this was its penis.