Tourette's Syndrome.
The ticks aren't a bunch of fun, but the profane outbursts at inoportune moments is high humor.
When I move to my next job, during the interview, I'm going to tell them I'm afflicted with it.
Boss: Russ?
Russ: Yes?
Boss: I need you to come in on Saturday.
Russ: Mmmmmmmmm (huff huff.. puff) BITC! CU! ****
You get the picture.