Eggnog causes flatulence. Hilariously offensive and funny Christmas t-shirts apparel gifts and xmas decor featuring Saint Nick himself. Send funny holiday greetings to your friends coworkers and family with our funny Christmas cards, or check out our funny Christmas t-shirts instead of that tacky Christmas sweater you usually wear. Great for your holiday parties and festivals. Santa Claus has flatulence, this Christmas leave out the air freshener.