Tripping in public is embarrassing enough, but it's a whole other story if hundreds of people are watching and cameras are recording your every move (Madonna can tell!). A Queen's Guard had that painful experience right in front of Buckingham Palace during the Changing of the Guard — one of the most popular tourist attractions in London. We may all be a bit clumsy from time to time, but what makes this video extrafunny is that the Queen's Guards are so famous for their serious demeanour. Even the guard himself couldn't help but flash a little smile after the embarrassing moment. Watch the incredible stunt (did we mention he is carrying a gun?) above, and then check out more viral videos.