When I was young I almost fainted, was cutting carpet for my landy to absorb the water so the carpet would freeze in the winter. It's a landy thing. Wasnt the knife it was the razor edged steel straight edge, slipped off steel, (using edge of Wall) straight over metacarpophal joint index finger on right hand, said ouuch a few times, held with other hand, didn't feel too bad, let go, so far so good, bit blood, wiggle finger bit more blood, bent finger, skin peeled white joint popped straight through, had diminishing vision and had to sit down. Got back up after feeling rather stupid, stuck finger back together with insulating tape and finished off carpet.