It's Always Sunny in Philadelphia, Season 3

(Cut to the front of the bookstore. Frank and his gang buddies are playing jacks while Mac looks on in bewilderment and disgust.)

Mac (sarcastic):
This is very intimidating, Frank.

Frank:
Don't worry, we're sending out an strong message, Mac, don't you worry. (A man and his kids walk by.)

Man:
Hey, look, kids, it's a 50's doo-wop group.

Mac (does a double take):
What?! No, we're not a 50's doo-wop group!

Man:
Hey, listen, would you sing us a song?

Mac (annoyed):
We don't sing, guy!

Frank:
Oh, yeah, we do. We'll sing, we'll sing for you. Right, boys?

Mac (dumbfounded):
You guys sing?!

Frank:
Of course, we sing! We're a gang!

Mac:
No, no, no, no, gangsters don't sing!

Frank:
What're you talking about? You ever hear of gangster rap?

Mac:
we're not gonna intimidate anybody if we're entertaining the whole goddamn neighborhood!

Frank:
Listen to this: (They break out into song.)