Sherlock, Series 01, Episode 01, A Study in Pink
Jeff: It's pure genius. I know how people think. I know how people think I think. I can see it all like a map inside my head. Everyone's so stupid, even you. Or maybe God just loves me.
Sherlock Holmes: Either way, you're wasted as a cabbie.
either way: used to say that something will be the same whichever of two things happens or is true.
cabbie: a taxi driver (also cabby)