Is Bathtub Racing The World's Weirdest Motorsport?

There are only two rules in bathtub racing: your vehicle can't have more than two cylinders and it has to be a bathtub on wheels.

Unsurprisingly, this form of motorsport hails from the Netherlands, the country that brought us reverse racing. In fact, the same guys who built this featured bathtub racer were responsible for the legendary Roll Golf and the half tractor/half car donut machine.

Is there a weirder motorsport in the world?