Police in Germany have confiscated what's thought to be the world's fastest office chair.

Two 17-year-olds had pimped up the offending seat by adding a lawnmower engine, bicycle brakes and a metal frame.

The teenagers claimed they had only tested their contraption by riding it a few metres, but witnesses had reported seeing it whizzing about all over the streets of Gross-Zimmern.

The pair were arrested. Officers are considering charging them with a variety of offences - including riding a vehicle without insurance, licences or registration.