Having failed to parlay Santa Claus' acerbic, fast-talking, acid-tongue misanthropic big brother, Fred Claus, into scads of box-office green, Vince Vaughn is now prepping for his next role. This time, he's aiming to portray the fictional older brother of another American marketing icon in a movie about the sallow, pasty, nicotine-addicted, womanizing, cantankerous little brother of the Pillsbury Doughboy. Brain Grazer is set to produce, and Brett Ratner (obv.) will direct the feature, currently operating under the working title, The Pillsbury Fat Ass.