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I see know reason why not. Animals gnaw their own limbs off from time to time. I know a dog that severed his own penis off for no reason. Last year there was that story of that guy who got his hand trapped under a boulder while hiking by himself and cut his own hand off with a pocket knife while drinking his own urine. People induce pain on themselves all the time, why should this be any different?
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Aforementioned Hiker