Mine stayed happy for the duration of the first beer. He got progressively worse with each beer and it was like flipping a light switch going from happy to mean, obnoxious, angry, argumentative then, finally, miserable and depressed. As I recall, the process from "happy to the inevitible took all of half an hour.
He may have been "happy" during this short time but I was miserable and on edge because I knew what was coming. No fun for anyone..........