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Travis Pastrana (top) of the US performs an FMX back flip on his dirt bike over a hovering 43-foot (13-metre) helicopter (below) in front of the Sydney Harbour Bridge on October 28, 2009. Pastrana has performed other stunts around the world, including jumping out of a plane with no parachute and jumping off his motorbike into the Grand Canyon. AFP PHOTO / Greg WOOD (Photo credit should read GREG WOOD/AFP/Getty Images)

Travis Pastrana (top) of the US performs an FMX back flip on his dirt bike over a hovering 43-foot (13-metre) helicopter (below) in front of the Sydney Harbour Bridge on October 28, 2009. Pastrana has performed other stunts around the world, including jumping out of a plane with no parachute and jumping off his motorbike into the Grand Canyon.   AFP PHOTO / Greg WOOD (Photo credit should read GREG WOOD/AFP/Getty Images)