Well, at least he had character progression in #ChristmasVacation and only daydreamed about inviting Mary over for a skinny-dip and didn't do it in actuality. I've only seen part of #EuporeanVacation and none of #LasVegasVacation, nor any of those other #NationalLampoons movies that are about Eddie but might mention Clark. He might get worse again as the franchise continued.