User:ACCH/sandbox

If jumping from a building, 10+ stories is necessary to be reasonably sure of dying.

The best way is probably to lie with your neck on the rail and hope for decapitation. Find a blind bend on a HIGH SPEED train line.

Drinking
(Too much) water can kill you. It works by washing out the salts in your body, until the cells fail. A minimum of 14 litres is probably necessary. It's unknown how reliable this method is.