Does anyone have any happy stories or jokes? Can you tell them?

I am a university teacher. One day I changed the test paper for one person. The first side of the paper (a double-sided paper) said: Teacher, I really don’t know how to do it. You don’t need to turn it over. I turned to the second side and there was only one sentence on it: Teacher, you don’t know how to do it. Believe me?

A mental hospital built 100 walls around it to prevent patients from escaping. Two patients met to escape on a dark and stormy night. When they climbed to the 99th wall, Person A said: "I'm so tired, let's crawl back." B said: "Okay!" So, they crawled back again...

A patient came out of the operating room in a panic He ran out and said: "It's so scary. The nurse said that everyone has a first time, calm down!" The family member said: "Isn't this good? I'm comforting you!" The patient said: She said this to the surgeon! "