Moviefone ‘Unscripted’ featured ‘High School Musical 3: Senior Year’ stars Zac Efron, Vanessa Hudgens, Corbin Bleu, and Ashley Tisdale interviewing each other about the film. The discussion features Corbin talking in a helium voice, Vanessa takling about being starstruck meeting Celine Dion, Zac revealing the best prank he played on his co-stars, and Ashley explaining the most important lesson she learned in high school. Watch the video below.