When I had a job as a signmaker I was weeding the vinyl and wanted to use a new scalpel. On this particular new scalpel the plastic protective lid was too tight, so holding the lid in one hand I pulled extremely hard on the handle of the knife with the other.
When the seal finally broke my arms flung apart from the force I had been exerting. Unfortunately my natural reflex was to counter this movement, meaning my arms flung back inwards with quite a force.
I didnt feel a thing, but when I looked at my hand that had been holding the lid I had managed to embed the entire length of the scalpel blade into my finger during the recoil of my arms.
It was so sharp it sliced straight through without me even knowing it had happened, but it left one hell of a deep slice into my finger!
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