Leon when he gets his face ripped off by those insects in the caves in RE4
Leon when Dr. Salvador gets him...
Leon when the garrador, or however you spell it, gets him with the move where he shoves his claws through his head, then through his stomach...
Brad when Nemesis jacks him UP...
The cop in RE2 who's body you examine saying "His head looks like it was twisted off" You just KNOW a Licker got his ass...