Sometimes, if I spend too much time around positivists, I get this creeping fear that they'll actually discover immortality.
A life of perpetual fear and labor, without even the release of death--that is Hell--and there are people fantasizing about how they will make it happen. Apparently well-meaning people, who are all the more terrible and dangerous because of this psychotic break from reality that makes them believe things will get better under capitalism.
Of course, there is also the obvious torture use of such a thing. Keep someone alive and imprisoned for centuries, until they go so crazy they start to believe that other people and the outside world were just products of their imagination.