A
Think of your favorite joke. Now remove the clever punchline. Congratulations — you've just written an anti-joke.
What are Antijokes? Anti Jokes (or Anti Humor) is a type of comedy in which the you are to expect a typical joke setup however the joke ends with such anticlimax that it becomes funny in its own right. The lack of punchline is the punchline.
Here's a few I found amusing from de internet:
What did batman say to Robin before they got in the car? Get in the car.
What is red and smells like blue paint? Red paint.
Ask me if I'm orange. "Are you an orange?" Nope, I'm a person.
What's red and bad for your teeth? A brick.
Do you have some to share? Or can you make your own funny ones?