For some, flying off a ramp and flipping dozens of feet into the air on a motorcycle might sound like a nightmare. For Josh Sheehan, growing up watching old Crusty Demons FMX (freestyle motocross) movies in the small Australian town of Donnybrook, it's a dream. And now it's his dream job, flinging himself through the air with Travis Pastrana's Nitro Circus extreme sport stunt collective, coming to the BMO Harris Bradley Center Thursday night.