A custom built ‘DeLorean Hovercraft’ made from fibreglass-wrapped styrofoam coated with metallic paint, powered by two Briggs & Stratton lawnmower engines (one for lift, the other for thrust).
Originally built in 2008, improved and upgraded many times since, it can hover 20cm above any flat surface and hit 50km/h on calm water.
Currently for sale on eBay for €40,000, 10% of which will be donated to the Michael J. Fox Foundation for Parkinsons Research.