Shortly after the creation of man, the various body parts got to talking.
The brain, being somewhat self centered said to the other parts, "I am in charge around here. I do all the thinking so I alone should do all of the controlling."
The stomach said, "I disagree. I process all of the food and supply you and all the other body parts with the energy and minerals you all need to function. Therefore, I should be in charge."
While a rousing debate between the brain and the stomach raged, suddenly, the anal orifice said, "Quite! Your both wrong. I am the one around here that is in charge around here."
The brain and stomach both looked at the anal orifice and said in unison, "YOU??? Your nothing but a small, insignificant orifice. You can't be in charge around here."
The anal orifice said, "We'll see about that." and it immediately stopped doing its job.
Within a day, the brain couldn't think about doing anything but taking a crap and the stomach lost all of its appetite for food or drink.
After three days, both the brain and stomach had enough and they said to the anal orifice,
"OK. OK. YOU WIN. You can be in charge around here."
And ever since that day, bosses around the world have been ass holes.
(I've known many bosses that weren't, but the majority of the bosses I've known qualify, totally.)