Hehehe! This is basically the soccering equivalent of the old “Stop hitting yourself! Stop hitting yourself!” trick.
Manchester City’s Vincent Kompany hops on Giorgio Chiellini’s back, grabs hold of his shoulders, and inadvertently(?) controls the Italian’s head so that the incoming cross sails into his own goal. Most definitely a foul, there. Not quite what we thought would happen, but that’s why you play the game.