Banned (but funny!) commercial

Hahahahahahahaha! I remember this commercial! :lol:
It was a big joke here. It was played in the Netherlands (Holland) which is our mother country as we're part of the Netherland Kingdom.
That was so funny! The thing is that most people in Holland speak English as it's given as a subject in school.
 
I don't get it. Can anyone please explain it to me? Thanks.
It's a language training institude. The whole reason for the commercial is that if these people KNEW how to speak English they wouldn't be bobbing their heads to this song. The only reason they are dancing to it is b/c they don't understand what the song is saying. Get it?