Rabid Red Sox booster Carla Tortelli (Rhea Perlman) gets steamed when boorish Yankees fan Ed Kellner (Ron Karabatsos) drops in at Cheers. So inflammatory are Ed's abrasive anti-Boston insults that Carla ends up slugging the guy. As a result, Ed threatens to slap an enormous lawsuit on Sam (Ted Danson) unless Carla is immediately fired. But never fear, there's a "sweet revenge" finale in this classic episode. ~ Hal Erickson, Rovi