The office hypochondriac - used to sit opposite one & got details of every little niggle, ache & pain. She was a walking medical dictionary. She had a fully stocked pharmacy in her office drawer. Always calling in sick (and guess who used to have to cover). The best was when she called in sick one day - when asked was she OK, she said it was really more her boyfriend than herself (bad enough) and went on to describe his (private & embaressing) problem - which was not life treatening.
The "I'm better than you" co-worker" - We started on the same day, we did the same job, for the same pay, but this guy decided he was better than everyone else. I didn't realise I knew his girlfriend from school & bumped into her as she was waiting for him one day. He left her waiting saying he was stuck in a very important meeting (Tetris can do that to you!!). So me & her got chatting & she asked if I was working for "Joe", how fantastic it is that he has such an important job & so many staff reporting to him - he had told her he was doing our managers, managers job!! He arrived out at that stage & I simply said - "No, I don't work for "Joe", in fact we are both on the same step of the career ladder - the bottom step" They broke up later that week. I could write a book on this guy alone.