What's your dark passenger like?

I think the phrase was coined by the TV show "Dexter." If you're unfamiliar, Dexter was a serial killer. It was his "Dark Passenger" which gave him the urge to kill. As a sort of compromise, he settled on killing bad guys, mostly. It's said we all have a Dark Passenger or demon inside us that compels us to do bad things.

Oh. No, I've not familiar with the show. Thanks.