I have a guy that works for me that is extremely annoying. I think he has Narcissistic Personality Disorder. He is constantly talking about how awesome he is at everything. He makes outrageous claims about his achievements in life, like how he used to be in a band and toured with a big nationally known group as the opening act, they made a CD, but has no proof of it.
He will ask me a question about our job, and when I answer it he says "That's what I thought." every time. He is 5 foot 6 and weighs 320 pounds, and talks about all the women that are falling over him all the time. He even faked a stroke at work one day! I know it was fake because he would hold his arm to his side and claim he couldn't use it, and he clinched his jaws and talked through his teeth, but when we got busy and he wasn't thinking about it he would use it to lift heavy things and type and spoke just fine.
He says things like "everything is about me" and "I am THE man" constantly. He honestly believes that every woman that walks in wants him. He tells me that he does most of the work and makes me look good, when the fact is I can hardly get him out of his chair to do anything! He believes he is entitled to everything, and when vendors come by to talk to me he feels that he needs to interject his opinion. He told me he does that so I won't make the wrong decision. If they leave me a sample or take me to lunch, he gets mad that they didn't do the same for him.
We set a company record for sales one month and he got angry and vocal about how the owner of the company didn't buy us lunch. He comes in to work talking about how he had sex with his girlfriend for hours the night before, when he can't lift 10 cases of product (weighing about 20 pounds a case) without taking a break. He can't complete an order on the computer without my help, and when he finishes the order (he has been there for over a year now, using the same program) he talks about how he busted his butt on that one and I could "take notes and learn from him". Anything anyone does, he could do better and he tells them so.
When things are bad for him, they are to extreme! He gets depressed easily and will lash out at anyone for any reason if it strikes him wrong. He will be up one minute, and if a little thing goes wrong, his day is ruined and he starts the downward spiral. This is just the tip of the iceberg, it gets worse and more self centered.