Sometimes, as a subway approaches the station at a very high speed, I feel the impulse to jump in front of the train. Not because I have a death wish or suicidal tendencies, but because of the thrilling sensation and the morbid curiosity of "what if?". That being said, I have a pretty good idea of what would happen, but it's an exciting feeling to know that all you need to do is follow that impulse and jump.
I've googled this and apparently there is a french expression for this feeling, "l'appel du vide" or the appeal of the void. Heights give me mixed feelings. I am still horrified by the terrible and tragic demise of a colleague who plunged twelve stories to his death when he accidentally fell out of the window he was trying to close. But at the same time and battling this rationality, there's the appeal of the void.
I got one of the strongest appeal of the void ever yesterday on the Northern rim of the Gran Canyon. Everytime I have this "appel du vide", I wonder if there has ever been someone who, without ever planning it or without having a death wish, followed this impulse and actually jumped into the void.