This one's for you Legato! (as in legato the CBR member):
Dirty Harry: Scorpio getting shot through the leg and subsequently tortured by Callihan in the middle of a football field with no one around to help him. That felt so good when I watched it
Dirty Harry (again): Scorpio's "execution" via 44 Magnum.
Gladiator: That sniveling little bitch Commodus getting stabbed to death in front of all of his own subjects.
Ben Hur: Messala getting trampled by a fleet of horses and then dying a slow death. My #1 most satisfying by far