This is a good knife for self-defense/murder.
Emerson Combat Karambit
Kind of pricey though. I plan on buying it when I feel like I can throw away $300. The Emerson wave design is bad ass. A little notch on the blade catches on your pocket, drawing the blade as you pull it out from your pocket.
Ignore the faggot twirling the fucking knife around and just watch how fast that blade comes out.