- Directors: Jeremiah Chechik
- Producers: John Hughes, Matty Simmons
- Writers: John Hughes
- Genres: Comedy
- Actors: Chevy Chase, Beverly D Angelo, Juliette Lewis, Randy Quaid, Johnny Galecki, John Randolph, Diane Ladd
The movie begins with Clark taking his family on the search for a perfect Christmas tree. After aggravating nearby motorists, getting stuck under a big rig, and walking in the woods for a long time, Clark finally finds said tree. (He digs the tree out himself because he forgot the saw.) Clark breaks several windows and gets covered in tree sap setting it up, as it barely fits in the yard, let alone the living room.
While shopping for gifts at a downtown Chicago department store, Clark meets a saleswoman named Mary (Nicolette Scorsese). He makes a series of Freudian slips to her on their first encounter, and later fantasizes about her skinny-dipping in his future pool (interrupted by his cousin in law’s daughter).
Clark has been working on a project at his firm which he expects will bring in a good Christmas bonus. Clark plans to use the bonus to put in a swimming pool, which he has already laid down a $7,500 deposit on.
As Christmas approaches, the many members of Clark’s extended family begin arriving to stay with him. Clark’s and Ellen’s parents are the first to arrive. This drives him to go set up the lighting on the house with his son Rusty. He covers nearly every inch of the home’s exterior and yard with lights (according to Clark himself, a grand total of 25,000 Christmas lights). Clark becomes very frustrated after many attempts to get the lights working. Unknown to him, the electricity wasn’t on to begin with. When Ellen heads to the back store room to get something, she clicks a light switch, lighting the house (and causing the power plant to switch to nuclear generators for backup power), and blinding their unfriendly yuppie neighbors. After the lights are up and running, Ellen’s cousin-in-law and cousin, Eddie and Catherine, along with their children show up to stay with him for a month, with their dilapidated, rusty RV parked in the driveway the whole time. Stifling his disappointment at their surprise arrival proves difficult for Clark. However, Clark and Ellen are concerned about Eddie’s children, as they won’t have many, if any gifts, for Christmas, due to Eddie’s seven year unemployment. Later on, Clark treats Rusty, Eddie, Catherine and others to a sledding trip. Clark then adds a sheeting of a “Non-Choloric, Silicon-Based Kitchen Lubricent that his company had made, but results in the chemichal compound to shoot Clark about 800mph and for abot 1 mile, leading to Clark becoming severly injured.
Uncle Lewis’s cigar ignites the gas from the sewage Eddie had earlier dumped down the street drain while emptying the holding tank on his RV, blasting a Santa ornament into the sky. Everyone watches the strange but touching sight, as Clark realizes his dream of the perfect, albeit weird, family Christmas.