I've seen similar flying from Australia, a couple years ago with a morning flight Perth to KL, there was a large group of Aussies, some sport team, about 15 of them, they were getting stuck into the piss in the departure lounge at 6:00am, by the time the flight left they were all well oiled and kept getting out of their seats and blocking the aisles talking with each other, worse were the ones sitting in their seats listening to music with headphones on, often turning around and bellowing out to one of their mates 4 or 5 seats behind, oblivious to the fact that one's voice shoots up in volume while listening to loud rock music through headphones.