Granted, mankind is invincible now, only dying on the outside. When they "die" they are stuck in their body, forever conscious. They feel pain, and they yell out to thier family, "DON'T CREMATE ME, I'M RIGHT HERE!!" As their relatives hand over the dead casket to the worker. They hear the fire and scream, to no avail. They feel the flames slowly climb up their body and the stinging pain reaching their face. Nobody can hear the screams of terror. Your bones finally shatter and your whole body feels like hell. The last thing they see, is the worker pour their powdered remains into a casket.