Easy,
Joe Pesci in GoodFellas, or Casino
In my oppinon he is the Villain of the Movie(s), here's a line from Casino, off the top of me head.
"You Know, there's some things you dont know about me, Like tomorrow morning I'll wake up bright and early and take a walk down over to the Bank, And if you dont have my money for me, I'm gonna split your fluff'n head wide open in front of everybody of the bank.
And just about the time I'm gettin out of jail, Hopefully, you'll be coming out of you coma, And Guess What? I'll split your fluff'n head open again, cause I'm fluff'n Stupid!
Thats one of my Favorite Lines from any movie EVAR!