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 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.
A little boy asked his father, 'Daddy, how much does it cost to get married?' Father replied, 'I don't know son, I'm still paying for it.'
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?'.
I was walking in the old cemetery at midnight. The moon was full and cast an eerie glow. Suddenly, I saw a figure in a white dress floating among the tombstones. It didn't make a sound as it moved closer. I froze in fear, and as it got nearer, I could see its hollow eyes staring right at me. I ran as fast as I could out of there.
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.
The brevity. They are short and can be quickly told and easily remembered. It allows for a quick jolt of horror. Also, they often rely on common fears we all have, like the dark, the unknown, and being alone. For example, a story about a strange noise in an empty house at night plays on our fear of the dark and the unexpected. The short format means the fear is concentrated and hits hard.
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.'
Sure. A magician was walking down the street and turned into a grocery store.