I feel so outclassed.
I'm not neccesarily a knife maker, but I did hire a few ex-cons who did hard time to teach me how to make (and use) a prison shank.
I feel that a shank can be almost as deadly and useful as a "real" knife (my paramedic experience with the prison system supports this), and they can be made from materials that are cheap, or even free.
One of the more interesting shanks can be made by sharpening a bone from a chicken or turkey leg.
If it's ground down and shaped in the right way, it will go through a leather motorcycle jacket.
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