9. BiffCo (Back To The Future Part II)
If you thought your boss was bad, be grateful you're not working for Biff Tannen, the notorious douchebag villain of the Back to the Future franchise who, after discovering Marty's Sports Almanac as an old man in 2015, travels back to 1955 and hands it to young Bill, who places the appropriate bets listed in the book and becomes the richest man on Earth. Rather than become a philanthropist or try to help people with his wealth, he decides to invest in toxic waste dumps, and basically commits himself to ravaging the world in every way imaginable. So potent are his damaging effects that Hill Valley ends up being nicknamed Hell Valley, and his ascendancy ends up changing the course of the world, with his influence allowing Richard Nixon to be elected five times, causing the Vietnam War to drag on much longer than it actually did. Not only awful on a personal level, the guy seems to have it out for the world at large too.