I once was on a flight where someone has started drinking their own stash. Believe it was a Friday evening DFW-SAN flight if I remember right. Flight attendants warned him there would be cops waiting to have a chat with him if he didn’t stop. He didn’t stop. Sure enough, as soon as we pulled up to the gate in San Diego, they asked us to remain seated and the police were there to escort him off. Always wondered what happened to him.