For me it has to be the razor. I don't mind the blood, and I want to feel it happen - to feel the tesitcles slithering out of the scrotum as I slice it open, feel them crushing against each other in my hand, grinding together as I stretch them out for my blade, feel each ball pop between my fingers as I dig my razor in at one end and slice right through to the other, carving them in half and squeezing out the insides, and finally feel what's left come free as I slice them off, drop them to the floor, and grind them into the ground with the soul of my boot.