This Christmas Vacation t-shirt features an image of Clark Griswold wearing a Santa Claus hat as snow falls. The shirt reads Merry Christmas Kiss My Ass. In the movie National Lampoon's Christmas Vacation, Clark Griswold told his boss that the Griswold family was flattered to receive his Christmas card...only to learn that it was a corporate card. As Clark's boss and his associates walked by, Clark wished them a merry Christmas by saying, "Kiss my ass, kiss his ass, kiss your ass, happy Hanukkah".