The Battle of Birthday Bay - S1.E18

Mark and Tom have a surprise for Ellen's birthday. They are going to a cabin deep in the woods to spend a few days. When they get there they discover that the cabin has been broken into and is inhabited by a family of panthers. After they have scared off the panthers and regained control of the cabin, Ellen says this excursion is the dumbest idea Tom ever had and the best birthday of her life.