A man was staying in a supposedly haunted hotel room. He heard strange noises all night. In the morning, he found out it was just the old radiator making those spooky sounds. Turns out the 'ghost' was just a creaky old heating system.
A man goes to the doctor. He says, 'Doctor, you've got to help me. I keep thinking I'm a deck of cards.' The doctor replies, 'Sit down and I'll deal with you later.'
A man went to the dentist. The dentist said, 'You need a filling.' The man replied, 'No, I don't like fillings. I only like ice cream.' The dentist was so amused that he almost dropped his drill. Then the man added, 'Can you put ice cream in my tooth instead?'.
A group of friends decided to explore an abandoned mansion. They heard eerie moans. As they tiptoed towards the sound, they found a leaky pipe. The water dripping was making the moaning noise. They all had a good chuckle at how scared they had been over a simple plumbing issue.
They are concise. For example, like 'The fish went to school. It got an A in swim class.' It gets the humor across quickly without a lot of extra words.
There was a man who thought he could fly. He climbed up on his roof and flapped his arms as hard as he could. Of course, he didn't fly but instead tumbled down into a bush. Luckily, the bush was thick and soft, so he was only a bit scratched. His neighbors saw the whole thing and couldn't stop laughing for days.
Once there was a magician on a plane. He told the flight attendant he could turn into a dove and fly off the plane. The attendant said, 'Show me.' So he did his magic trick. And the attendant said, 'Well, now go into the baggage compartment.'
Once upon a time, a magician was performing on stage. He said he could make a rabbit disappear. He waved his wand, said the magic words, and opened the box. But instead of the rabbit disappearing, his assistant was gone. The magician was so shocked that he accidentally turned himself into a carrot.