I can't believe no one brought up the "execution" deaths in RE4; basically, they're a special little scene that plays out when your health is in the red and the blow dealt does enough damage to kill you. For example, the chainsaw dude's execution kill has Leon holding the chainsaw back until the chainsaw goes into his neck, and Garrador has this awesome thing where he impales his head, then guts him. They're pretty gory, but cool.