In 1967, the Grand National witnessed one of the biggest shocks in racing history. At the 23rd fence, a huge pile-up blocked nearly the entire field. Only one horse, a 100/1 outsider named Foinavon, managed to jump cleanly and carry on. While others tried to catch up, Foinavon kept going and won the Grand National against all odds. Even better – anyone who backed him on the Tote got odds of 444/1! | Grand National Guide