Colin Furze's Pulse Jet Bicycle -- 50 MPH on Homemade Jet Power

British plumber Colin Furze hand-built a pulse jet engine using nothing but an angle grinder, some steel tubing, and a roll of duct tape, then bolted it to his friend's mum's old Raleigh bicycle -- which he lovingly named "Norah." The jet burns so hot that Furze had to extend the bike's frame by several feet just to keep the rider a safe distance from the three-foot column of flame shooting out the back. He then rode the screaming, fire-spitting contraption through the quiet English countryside at over 50 miles per hour, pedals still attached and functional because he wanted to preserve the bicycle's fundamental "bikeness." The build video has racked up over 37 million views on YouTube, making it one of the most-watched DIY engine builds in internet history. Furze, who holds multiple Guinness World Records for his absurd inventions including the world's fastest bumper car and a working Wolverine claw, built the entire pulse jet from scratch in his garage workshop -- proving that the only things standing between you and jet-powered transportation are a welding torch and a complete disregard for personal safety.