Old joke but it's so funny
One day, the body parts were having an argument about who should be the boss. The brain said, "I should be the boss because I control everything and make all the decisions." The heart said, "I should be the boss because I pump blood and keep everyone alive." The stomach said, "I should be the boss because I process food and provide energy."

Then the asshole spoke up and said, "I should be the boss because I'm responsible for waste removal." All the other parts laughed and said, "You can't be the boss, you're just an asshole!"

So the asshole went on strike, and soon the brain got foggy, the heart got weak, and the stomach got upset. Eventually, the body parts agreed that the asshole should be the boss, proving that you don't have to be a brain to be a boss—just an asshole.