feeling death

i wonder what it feels like to hit the pavement after jumping off a building or whatever. would you even feel it all? is it too quick? or would it jsut be one final instant of insanely intense pain. the same question  goes for getting beheaded. like your head is still alive for a second or two after it gets chopped off.. can you feel all those severed nerve endings in your neck? the split of bone and your spinal chord and all that stuff? too bad well never know cuz everybody who could tell us is DEAD