TEACHER: Why are you late?
STUDENT: Class started before I got here.
TEACHER: Donald, what is the chemical formula for water?
DONALD: H I J K L M N O.
TEACHER: What are you talking about?
DONALD: Yesterday you said it’s H to O.
TEACHER: Clyde , your composition on ‘My Dog’ is exactly the same as your brother’s.. Did you copy his?
CLYDE : No, sir. It’s the same dog.
Teacher: Why do we sometimes call the Middle Ages the Dark Ages?
Peter: Because they had so many knights.