Rick Grimes (aiming gun at Merle): Ought to be polite to a man with a gun. Only common sense.

Merle Dixon: You wouldn’t. You’re a cop.

Rick Grimes: All I am anymore is a man looking for his wife and son. Anybody gets in the way of that is gonna lose. I’ll give you a moment to think about that.

From The Walking Dead – Season 1 Episode 2: ‘Guts’ (1×02)