This 80sTees.com exclusive Christmas Vacation t-shirt features an image of Marty Moose's head wearing a Santa Claus hat. 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.