Colin Furze, maniac maker of maniac things, like the maniac 80km/h baby stroller, has decided to attach a fire-breathing jet propulsion system to an old woman's bike, because that's what maniacs do. As you can imagine, it's not ridiculous at all.
It's completely ridiculous. You can see the jet bicycle almost reach 80km/h. Furze says the bike can actually go faster, but staying on is the challenge, since the old bike's wheels are so crappy. You can see how Furze make the pulse jet bicycle here. I would recommend you to not do this at home. [Colin Furze via The Awesomer]