April fool's day

  I remember when I was in elementary school. I was a naughty kid, so when April fool's day came, I played tricks on others a lot. The one I was impressed the most was I played a trick on my Art teacher.
  On that day, I was really excited, I had planned for that moment for a long time. When Mrs. He, my Art teacher opened the door, I told her that my Maths teacher wanted to switch class with her because she needed to go to her doctor appointment during her class period. Mrs. he was a really old lady, she didn't know that day was April fool's day. Also I was her favorite kid, she trusted me a lot. She nodded, and then made sure which period she would come back. She then left the room, and brought her stuff away. I didn't know how to deal with this, I wanted to say about April fool's day, but I couldn't. It would be embarrassed to say,  but I didn't want  to get  demerits. So I decided after a second, I ran to her, apologized to her. And I explained about April fool's day to her, then she laughed and said thank you for teaching me that.
  I was really appreciate about her tolerance, I knew I wouldn't joke about these kind of serious things again.