Nutty stuntman Dirk Auer takes on the Mammoth rollercoaster at Trips Drill theme park, Stuttgart, Germany in a pair of rollerskates in this photo released on July 20, 2009. The 36-year-old skated down an 860 metre track in just over a minute. The custom made skates used for the stunt were designed and made by Dirk Auer himself. It took him 110 hours to prepare for the stunt show. Each shoe has 16 wheels and weighs 20 kilogramms, 40 meters of aluminium.[CFP]