A man claims to have built a self-balancing unicycle by himself, using an Arduino mini computer.
The Thatch Industries Raptor is similar to a Segway, except the rider sits atop a saddle on a single wheel.
But what should be ridiculous is actually pretty amazing, as it self-balances forwards and backwards while pushing the rider forwards at 10mph.
The bike has a battery life of about two hours, and weighs 25kg. Take a look, above.