People in Japan know how to build very weird things. For example, this toilet bike that runs on poop. And it is fully functional and has even performed 870-mile (1,400 km) countrywide tour across Japan. People in Japan know how to build very weird things. For example, this toilet bike that runs on poop. And it is fully functional and has even performed 870-mile (1,400 km) countrywide tour across Japan. Source