I never know which kind of day it will be...

I had to deal with a coworker like that at my last job. She would be sweet as sugar one day, and then suddenly would sneak in an insult, or not talk to you at all... It drove me crazy! I wish I could give you advice, but I don't know what to tell you. I just waited it out, complained to my husband every day, and almost quit the job because of her. Before I had a chance to quit, she did. I was there another year and a half.

I feel your pain, truly I do. I have a coworker who can become enraged at the drop of a hat and she stomps around the office, everyone knows she is upset. It is really unfair that we are exposed to her behavior. On another note, she REFUSES to take holidays and now has the partners of the company infighting because she wants to be paid for those holidays that she isn't taking. The rest of us WANT her to take holidays so we can have a break from her moodiness. One moment she is angry at the world, the next she is happy and giggling. I think she is mentally ill. I just give her a wide berth and steer clear. So does everyone else by the way. After this latest "holiday issue", many of us have lost every last shred of respect we had for her and can't even look at her.