Humor is relative. You find something funny because it incorporates things that you are familiar with. You can empathize with the person who has become the butt of the joke. This is relative humor.
Comedy based on people's common experiences is insanely popular.
One of the most popular recent comic strips is Dilbert. Each episode is a different adventure that he has in his office life. The average office worker relates to Dilbert because each scenario is strikingly similar to his own corporate middle class lifestyle. The quirky little things that happen in the office are personified in the comic strip. The humor comes in that someone has actually taken these common occurrences and presented them as jokes.