It's Always Sunny in Philadelphia, Season 3

Dennis:
You know what, I'm walking from this. [Frank slaps him] Ow. What the hell, dude?!

Frank:
I'm knocking some sense into you, Dennis. This is all you got.

[He slaps Dennis again]

Dennis:
Ah! Dude, why do you keep hitting me?

Frank:
Don't talk back to me.

Dennis:
OK, sorry.

Frank:
Look, I'm going to get you out of this. It's you and me against the world. I'm not going to let anything bad happen to you.

Dennis:
You promise?

Frank:
I promise. And hey, I don't want to hit you, baby. So please don't make me, OK? You're my one and only. You've go to do right by me, OK?

Dennis:
OK.