When someone has two different voices.
I don't know if anyone else experiences this, but there's a guy I work with and at times he will talk in a normal voice. A happy voice that I've heard him use when he's on lunch, having a laugh, or out of work having a drink.
THEN... There's another voice he occasionally uses, which appears to be when he's in 'professional mode'... It drops down to a lower tone, he sounds more serious. It sounds like the world is on his shoulders, maybe because his voicebox is temporarily being controlled by the spirit of Louis Armstrong.
It's a problem on my part, hence it being in this thread, but when he uses his professional voice, I just want to punch him in the face.