Lionsgate has debuted the trailer for Dirty Grandpa, about an uptight kid played by Zac Efron who has to drive his lewd, perverted former-Army-general grandfather, played by Robert De Niro, to spring break in Florida. Ohhhh man this is one hell of a raunchy film, and not in a good way. At least they admit that De Niro's character is a "pervert", because damn is he an asshole. The cast includes Julianne Hough, Aubrey Plaza, Dermot Mulroney, Zoey Deutch, Jason Mantzoukas, Adam Pally and Henry Zebrowski.