A 5-year old kindergarten student was preparing for his first day at the "big school". The teacher had earlier suggested that the new kindergarten students buy their lunch for the first few days of school so that they were familiar with the process of buying lunch. As the mother was preparing the children for school, the 5-year old kindergarten student brought his piggy bank from his room and asked nervously "do I have enough money for lunch?". He thought that he had to use his own money for his lunch and would need to bring his piggy bank to school. Needless to say, the mother reassured him that he didn't have to use his piggy bank money for lunch.
I know this story well - the 5-year old kindergarten student is my own son!