It's happened to all of us -- but probably with fewer tourists watching.
One of the Queen's Guards took an unfortunate tumble outside Buckingham Palace during the Changing of the Guard, which takes place daily at 11:30 a.m. local time, weather permitting.
"I didn't expect anything like this to happen -- he went flying," says David Meadwell, who recorded the video from the crowd, according to The Telegraph. "There were quite a few people around and there were a lot of gasps as he went down."