@ Moe Greene not backing down when Michael asked if he was slapping his brother around.
Michael: Is that why you slapped my brother around in public?
Fredo: Aw, now that, that was nothin', Mike.
Moe didn't mean nothin' by that. Yeah, sure he flies off the handle every once in a while, but me and him, we're good friends, right Moe?
Moe Greene: I got a business to run. I gotta kick asses sometimes to make it run right. We had a little argument, Freddy and me, so I had to straighten him out.
Michael: You straightened my brother out?