This National Lampoon's Christmas Vacation sweatshirt features an image of Santa Claus's sleigh. The sweatshirt reads "Hap Hap Happiest Christmas."

In Christmas Vacation, guests staying at the Griswold house for Christmas tried to leave, and Clark stopped them and told them they were going to press on and have the hap, hap, happiest Christmas since Bing Crosby tap-danced with Danny Kaye.

Everyone will immediately know that you are a fan of the 1989 classic starring Chevy Chase when you wear this Hap Hap Happiest Christmas Vacation Sweatshirt!