There's a common belief, now thoroughly debunked, that the Ghorkha must never resheath his knife without giving it a taste of blood, hence the practice of nicking oneself deliberately whenever the knife is drawn for a more mundane purpose.
Now that I own khukuris, I understand a bit better where this belief originated. I think that the khukhuri user must get a lot of little nicks from his knife without meaning to.
The khuk has a LOT of edge, and lacks the 'axial balance' of a straight-bladed weapon. It is not as 'natural' in the hands. So it's easy to let it get away from you. I don't believe that even a lifetime of familiarity will overcome this natural tendency to turn and bite. I can count on the fingers of one hand the times I've cut myself while honing or using other knives (and I've still got all of those fingers after 55 years of being a knife knut) but I've nicked myself on my khuks over and over again. Little nicks...and working hard to keep it that way...
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The sword cannot cut itself, the eye cannot see itself.