The Euthanasia Coaster by Julijonas Urbonas
"The Euthanasia Coaster is an art concept for a steel roller coaster designed to kill its passengers. In 2010, it was designed and made into a scale model by Julijonas Urbonas, a PhD candidate at the Royal College of Art in London."
"The design begins with a steep-angled lift to the 510-metre top, which would take two minutes for the 24-passenger train to reach. From there, a 500-metre drop would take the train to 360 kilometres per hour, close to its terminal velocity, before flattening out and speeding into the first of its seven slightly clothoid inversions. Each inversion would have a smaller diameter than the one before in order to maintain 10 g to passengers while the train loses speed. After a sharp right-hand turn the train would enter a straight, where unloading of corpses and loading of new passengers could take place."