This knife is not actually for wasps, or made out of wasps, or anything like that. I bet you can't guess what it really does:
Yup, first you stab your opponent, then the knife releases a small ball of gas, that rapidly expands to about the size of a basketball, freezing everything in its path. I really hope we never see the, "Don't wasp knife me, bro!" video.
[$380, Wasp Injection Systems]
[Via Technabob]