1985, my first TATL flight -- MIA-MAD -- five drunk German men in coach were too rowdy for the FA to quiet them. She called the captain, who said they'd be removed if they didn't settle down. They did so, briefly, but by the time the plane was ready to push back, they were loud again -- not like earlier, but annoyingly so. After a long wait, during which the captain said we were waiting to resolve an issue (never described), an incredible swarm of uniformed people entered the back of the plane and the five drunk guys were gone.

Never seen it happen since, but there were a few I would like to have seen removed.