I once read that when the Martins' would host a party, and it began to get late and people would not leave, Dean would go up to his bedroom, call the police, make believe that he was a neighbor and complain that there was too much noise coming from the Martin house. And the police would come and tell his wife that is was too late and that she would have to break up the party!

That's how Dean would get his guests to leave without insulting them.