I once had a co-worker who clipped his nails at his desk. I am still not over the horror of it all. To this day, the sound of a clipper is still like that screeching sound during the shower scene in "Psycho."
I had another co-worker who was so universally disliked, other co-workers would Tweet "__^__ " when she was approaching, meaning -- "shark in the water."
(Read More: 10 Ways Sharks and Bankers Are Alike)
Yep, we all have our horror stories about co-workers from hell. Well, PayScale.com pinged their users on the worst co-workers they've ever had and man, did they get an earful!