An example of a funny joke about men would be: "Of course women don't work as hard as men; they get it right the first time." This joke is in the form of a one-liner, but jokes about men come in other forms, such as stories or questions and answers.
Here is an example in the question and answer style: "What do you call a man who has lost all of his intelligence? A widower."
An example in story form is as follows: "A man rubbed a lamp and a genie came out. The man asked to be stronger than any other man. He was given the strength to crush boulders. He asked for the world's fastest sports car, and a Ferrari appeared in front of him. He then asked to be smarter than any other every man on earth. He was turned into a woman."