When a teacher closes his eyes, why should it remind him of an empty classroom?
Because there are no pupils to see!

Why did the teacher put the lights on?
Because the class was so dim!

A history joke

How did Vikings communicate?
By norse code!

A math joke

Teacher: How much is half of 8?
Pupil: Up and down or across?
Teacher: What do you mean?
Pupil: Well, up and down makes a 3 or across the middle leaves a 0!

A history joke

What is a forum?
Two-um plus two-um!