George Clooney may be a legendary practical jokester on the set of his movies, but not at home with girlfriend Sarah Larson . Clooney, 46, insisted he's "absolutely not" planning to play any jokes on his girlfriend of eight months. When asked about his joking ways, Larson, 28, told Usmagazine.com at the Hollywood Leatherheads premiere on Monday, "he has his moments, yes, he's so funny!" The best part of attending the premiere? "Come on, tell them — wearing such nice vintage ...