Zac Efron and Vanessa Hudgens host a new trailer for the Disney big screen film ‘High School Musical 3: Senior Year’ from the set of the flick. In the trailer, Vanessa’s character Gabriella tells Zac’s character Troy, “I’m a lot better at saying goodbye than you,” prompting Troy to respond, “Why are you saying goodbye?” ‘HSM 3′ is in theaters on October 24th. Watch the preview via YouTube below.