No admission is required at The Speed Cult Compound in Michigan, where a group of "MacGyvers" built a 40-foot-tall, flame-throwing rollercoaster out of scrap metal and elbow grease. There's not much water in Missouri, so see how one resourceful redneck named Piss Willy flooded a field to create his own jet-sprint boat race course. In Florida, two young thrill-seekers are about to try an incredibly dangerous stunt: leaping off the roof of a house onto an inflatable "blob" made out of duct tape, a leaf blower, and two plastic tarps. "Kids, don't try this at home!"