Asshole Tendencies: Specializes in moping, sulking, self-pity, sucking all joy out of a room, and raining on parades.
Where To Spot Her: Lurking around the lunch buffet at a work meeting, lamenting the fact that she can't eat dairy and hasn't been promoted in 12 years.
How To Deal: Do not feed into Sadsack Sondra's tragic monologue, and do not let her dampen your enthusiasm. If you must talk to her, envision putting up a wall that will block all of her toxic vibes until you can find a chance to excuse yourself. Then give your happiest friend a quick call, just to renew your faith in humanity.