Nobody’s Walking Out On This Fun, Old Fashioned Family Christmas Create a funny scene in your yard this Christmas season with the National Lampoon’s Christmas Vacation Not the Brightest Bulb outdoor inflatable sign! The National Lampoon’s Christmas Vacation Airblown lights up and self-inflates in seconds. Just stake it down and plug it in! The set comes with the airblown, yard stakes, tethers, and an instruction manual- everything you need for quick and easy set-up! National Lampoon’s Christmas Vacation Outdoor Sign Self-Inflatable Yard Stakes, Tethers, and Instruction Manual