This is the setup to an old, old joke.
The parts of the body were arguing one day over who should be the boss. The Brain spoke first, “Well, since I control all body functions, I really should be the boss. Besides the control thing, I’m also the source of all intelligence. The only reasonable course of action would be to make me boss.”
The Hands had their say, “Yo, we do the work here. We make things. We get things done. We defend the body when we need to and we hold others or push them away. We gotta be the boss.”
The Feet weren’t to be denied. “We’re on the bottom, we know, but without us you get nowhere, man. You need feet to do their thing so you can get to where you want to do your thing. Clearly, we should be the boss.”
The Arms, the Legs, the Heart and Liver, all took turns presenting rational arguments about why they should be the boss. The other body parts listened respectfully and quietly as they each made a pitch.
Then the Asshole started to speak. “I think that I should be the boss.” The other body parts all laughed derisively. No one wanted to hear a single reason about why the Asshole should be the boss of the whole body. They all hooted him down and made rude, sarcastic jokes at his expense.
Naturally, the Asshole was upset and angry. So to get his revenge he just decided to close up. After a day, the body was in discomfort. Two days later, the body was in misery. On the third day, the body couldn’t even get out of bed, and was in danger of dying. The other body parts had an emergency meeting and decided that they had been bad, and the punishment would kill them. So they voted to make the Asshole boss, and let him know that.
The Asshole then relented and started doing its thing, and the body survived.
This proves that you don’t have to be a Brain to be the boss, just an Asshole.