I don't know the name of the actor but it's the black guy with the fro in Lock, Stock and Two Smoking Barrels... he has two great quotes:
"If the milk turns out to be sour, I ain't the kinda pussy to drink it."
"If you hold back anything, I'll kill ya. If you bend the truth or I think your bending the truth, I'll kill ya. If you forget anything I'll kill ya. In fact, you're gonna have to work very hard to stay alive, Nick. Now do you understand everything I've said? Because if you don't, I'll kill ya."
Then you have the great quote by Brick Top in Snatch:
"In the quiet words of the Virgin Mary... come again."