You've got to be closer to the edge than ever to win. That means sometimes you go over the edge, and I don't mean driving, either.
When you're watching Psycho, there' s that moment when you have a visceral reaction to watching someone being stabbed. And then you have the intellectual revelation that you're not, and that's where the celebration comes in.
The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.