I once cut the (fleshy) tip of my finger off using one of those reciprocating hedge trimmers. I was about 9yrs old.
Didn’t dare show my mum & dad so I washed it under the tap & stuck it back on with an elastoplast. Amazingly it took and nobody found out. Finger tip looks normal until my hand gets very hot or cold – and the bit in question is also numb
How? you ask – well I’d worked out that if I could hold my finger steady on the upper blade, NOTHING would happen when I pressed the trigger*, and of course that’s what I did
*… unless, of course, there was any kind of recoil/kick from the mechanism