Its an advert... involving a Gorilla, playing the drums, to Phil Collins' song 'In The Air Tonight'.
And its for.... DAIRY MILK!! The chocolate that is!
I find this advert very funny, very random and very confusing, all at the same time, and it makes NO sense what-so-ever!
Is this just a very clever piece of advertising to get people talking? Or has someone managed to slip past a 'joke copy' of an official advert that was supposed to be released :D
You can see the ad on the following Youtube clip!