Can you feel the testosterone in the air rising? That's because The Expendables 2 is about to explode into theaters. We recently looked at the 10 greatest movies from Sylvester Stallone. Now the time has come to turn our attention to Arnold Schwarzenegger. Arnold is enjoying an expanded role in the sequel, which is hopefully just the beginning of his big return to Hollywood stardom (including this winter's The Last Stand). From early classics like Conan the Barbarian to unexpected comedy gems like Twins and a little series called Terminator, these are the 10 best films in Arnold's lengthy career.