This Christmas Vacation t-shirt is designed to look like it could appear on an ugly Christmas sweater. The image shows snowflakes surrounding a moose mug. The shirt reads Griswold Family Christmas. Marty Moose was first introduced as the mascot for Walley World in the 1983 classic National Lampoon's Vacation. In the 1989 holiday classic Christmas Vacation, Clark W. Griswold was seen drinking out of a Marty Moose mug. National Lampoon's Christmas Vacation is one of the most popular Christmas movies of all time. Everyone will immediately know that you are a fan when you wear this Faux Ugly Knit Moose Mug Christmas Vacation T-Shirt!