Unbelievably, in 1937 the French military thought that they might need some motorcycles that were also half tanks as well. And one of these very rare 350cc engined half-track Merciers actually still exists as a museum piece. Strangely, this technological mess even featured front wheel drive. But like all crazy half-track designs, this vehicle sacrifices the speed and maneuverability of motorcycles as well as the true off-road ability of a real tank, offering the best of neither design. Further, this awful design looks nearly as dangerous to the rider as an any enemy action. Some things just shouldn't be built.