Miss the Son

My father wanted to buy some food. He took me along to the bakery by the bicycle. He rode on the front seat and i sat on the rear one. After i got some food and my father saw i came back the seat. Then i came back to pay money, while my father thought i took the seat, he leisurely rode at home. When my father at home. My mother asked, "where is our son". he answered, " he is sitting the rear" and he turned and looking the back, he was surprise. My father came back the bakery. I was still standing there.