Die A Lot more and also once again

After stealing a mailbox full of their neighbors mail and cheques the Spencer’s stumble across an invitation to a high society black-tie and gown affair. Posing as their neighbor’s the McNaughton’s the Spencer destroy the bar and offend the guests but in the end turn out to be hero’s after thwarting some vaguely European hostage takers. Think Die Hard with more chronic alcoholism and morbid obesity.