Spyderco Harpy.
Serrated, sharp, all stainless, shaped like a talon. Grabs and cuts a line in a second (I've only used it in non-emergency applications). Seems that is would double well as a self-defense weapon, for a guy who doesn't really know how to use a knife in self defence - IE slashing and gashing. Good for offshore communites where your firearm will be far away on your moored boat, or at home. And, for use when all else fails, including my feet, in a situation that requires deadly force, which is probably never.