Zac Efron is returning to familiar territory in his new film, Dirty Grandpa. In the same vein of humor as Neighbors, Dirty Grandpa follows an uptight guy (Efron), about to get married to a seemingly even more uptight woman (Julianne Hough), who then gets tricked into driving his grandfather, a perverted former Army general (Robert … Continue reading Zac Efron Takes Robert De Niro on a Road Trip to Spring Break in ‘Dirty Grandpa’ Trailer: WATCH