Have a coworker, sweet younger lady, who has had significant issues with paranoia over the past year or so. Came to a head some months ago, which resulted in her taking several weeks off under a doctor's care.
She came back a few weeks ago and I was talking with her, and it was evident that the paranoia was still pretty rampant. Was asking me if I was trying to get her fired (I was in charge of our team for a couple of months), or if the manager above me was trying to get her fired, was saying that everyone was whispering about her behind her back...
Monday she gave her two weeks notice. She told me that this place was toxic for her (yeah, it can be), and that she needed out of here for her own sake (yes).
Hate to see her go, though. Nice kid.