Our US Sugar Sisters recently sat down with Zac Efron and his onscreen little brother, Charlie Tahan, as they promoted their new movie Charlie St. Cloud. Zac, who puts in an impressive dramatic performance in the film, revealed his secret to stirring up emotions on the set. He admitted he was relieved that he avoided going head to head at the box office with his girlfriend Vanessa—her Beastly was originally scheduled to hit US cinemas on the same weekend as Zac's film but was pushed back. Zac also talked about his hopes for future roles and learning how to sail—watch our interview below!