Silvio to Matt Bevilaqua at the poker game. Matt was warned not to bother Silvio and he brushed his foot while sweeping cheese:
"I like the fucking cheese where it is! In fact, I stick provologne in my socks so that they smell like your sister's crotch in the morning"

Christopher when someone mentioned the Cuban Missle Crisis: "You mean that shit was for real?" Thirteen Days, the movie about it, had just come out.

When Junior scolds Tony about the new ways of settling things: "in the old days we settled things amicably", Tony responds: "yeah, I remember seeing that picture of Albert Anastasia in teh barber shop looking all amicable"
Furio, when the Jewish guy at the hotel gave him trouble for wanting a room. Furio reminded him that the hookers that they use often services him. "Don't bitch to me". I use that one at work all the time and try my best to get the accent down.