You know him (or her). He is the irrational employee. The irrational employee is usually a good producer or an essential person. Here is how to manage him, instead of letting him manage you.

Irrational employees learn that by behaving badly, they can intimidate others and get what they want. Essentially, they are bullies. They have hair triggers and strong personalities. People walk on eggshells around them, hoping they will not be set off. Instead of a smoothly functioning team, a team with an irrational employee becomes dysfunctional. Everything is tilted because of one person.