Today while going 130 km p/h on the highway I thought to myself: "What would happen if I just throw the wheel over? Probably some big accident, trafficjam for hours...." Anyone else ever thought that?
Also, I wouldn't call it sadistic. It's a more common train of thought than you'd think. For example, while standing with someone at the edge of a very tall cliff or a subway platform you might think "Wonder what would happen if I gave them a push"
The only issue comes if one acts on the thought. thinking it is not inhererntly wrong in and of itself. Humans are simply curios creatures, after all... we tend to wonder about "What will happen if I do A to cause B?"
