In 1984, Avianca Airlines, Spanish airline 707, had a crash, hit a mountain. They went into the rubble, everybody died, the plane is all over the place. Finally, they found little black box which has the cockpit recorder on it so they can get the dialogue that’s going on in the cockpit just before the crash so they can reconstruct what happened.
They get the tape out of the little black box and found a frightening discovery when they listened to the tape. The cockpit recorder indicates that just before the crash, a computer synthesized voice from the plane’s automatic warning system starts saying, “Pull up, pull up, pull up, pull up, pull up,” in English. Inexplicably the pilot shouts back, “Shut up, foreigner,” flips off the switch. Within seconds, the plane hits the mountain and everybody is dead.
What a parable of the way conscience is intended to work and how dangerous it is not to listen to it.