We had a 'fun' flight to Vegas in May. Group of men in their early 30's looked a little worse for wear, and proceeded to carry on drinking One of them decided to have a smoke in the loo, the other latter vomited in the loo.
The crew were not best pleased with either. They were eventually told firmly to stay put or else... The alcohol had been locked down by then.
Another group of younger gents were having a fine old time with the duty free JD that they had brought onboard.
It was a flight that I (and speaking to the Cabin Crew as they left the terminal) and they were pleased to leave.