YouTube Dirty Grandpa Has A Sex Scene That Will Gross Out Everyone! Ottawa, ON, Canada / JUMP! 106.9 January 22, 2016 01:52 pm One of the movies opening this weekend is Dirty Grandpa starring Zac Efron, Robert DeNiro and Aubrey Plaza. Aubrey Plaza stopped by Jimmy Kimmel to explain the weird sex scene that happens. Ew! I’m not sure if I want to watch it anymore… To read more from @JohnnyNovak, why not click HERE.