Marching in columns of two

The changing of the guard at the Amalienborg in Copenhagen. I was going to link to a colour version of the guards in my Blifolio before the great change took place and it was spirited away into the ether. Oh well, never mind!

While we were watching this one of the crowd of tourists asked a policeman, in English, what exactly was happening and the policeman replied, also in English, that it was "just like your ceremony in London" to which the tourist replied "Actually, I'm from Brazil". 

Who needs to learn a foreign language?