Speed
Credit: Ezra Shaw / Getty Images

There are only so many G-Turns, Helipops, and J-rolls you can do before you start to wonder: "How fast can a street luge go?" The answer turns out to be extremely fast, around 98 miles an hour if you're competing in the World Championships, which are held annually on an outrageous course in Teutonia, Brazil. The International Gravity Sports Association (you read that right) oversees the event and it's less fatal than you might imagine.