I got to see the queens guard in person a few times. A little kid was pushing it a bit too far. They are not required to stand without moving and will randomly switch positions. Well the kid pushed it and pushed it, that guard switched positions with his sword and missed the kid by inches. They both knew what just happened and the kid ran off to get a new pair of shorts. You can do almost anything to those guys except touch them or act aggressively. At which point, all bets are off