according to amazon.com:
Truck Antlers... turn your truck into a buck! Multiple uses for Truck Antlers... Fight road rage; Rattle in a big buck; For the Holidays.; Slide the base of Truck Antlers into the window of your truck - and enjoy the laughs. Be sure the points face forward. Truck Antlers are also functional rattle horns. Grab antlers by the base, rattle them together and watch the bucks come running. Decorate your antlers with garland, jingle bells or wreaths to show your holiday spirit.

i'm thinking that this is the perfect christmas gift for the mullet.