After a while we finished changing, and our teacher still hadn't come in. We used the time to draw on the blackboard to celebrate his birthday, and we thought that those boxes were cookies for us because of that. He said the cookies are for cheering for his class to help them get first place in the relay race, and he wanted to celebrate his birthday secretly. The price that he had to paid is that we all have the right to know which year he was born in.