what is national lampoon's christmas vacation on

"National Lampoon's Christmas Vacation" is a comedy movie that was released in 1989. It's based on the book "Christmas '59" by John Hughes, who also wrote the screenplay. The movie follows the Griswold family as they prepare for a Christmas holiday that quickly spirals out of control. It stars Chevy Chase as Clark Griswold, Beverly D'Angelo as Ellen Griswold, and Randy Quaid as Cousin Eddie. The film is known for its over-the-top humor and memorable moments, such as the climactic scene of the family's Christmas lights display.