I was on a flight from Havana to Brussels a few years ago and there was a group of Belgians who were completely plastered. The cabin crew refused them alcohol, they were seriously kicking off. The first officer came down to talk to them and one of them threw an empty can at him as he walked away. Lights went dim, and then an announcement that the pilot was returning to Havana where the group of passengers would be arrested and would be spending the night in a lovely Cuban prison. When we landed they were absolutely petrified, crying, begging for mercy. I can't imagine who nasty a Cuban prison would be.