Bad Grandpa (2013)

Bad Grandpa (2013) follows the eighty-six-year old elderly man Irving Zisman played by Johnny Knoxville in plenty of prosthetic makeup as he travels across the country with his eight-year-old grandson Billy (Jackson Nicoll). The pair go on a wild hidden camera road trip as Irving introduces Billy to people and places that are not suitable for children like strippers, bikers, funerals, beauty pageants and more. 

The unpredictable Johnny Knoxville definitely isn't going to behave just because he's playing a sweet old man. He's anything but sweet when he sticks his ass out the window of a car to give other drivers a view of his full moon. He later walks around in just his briefs...with his huge prosthetic balls sticking out! Those babies are enormous. They are almost as big as his prosthetic penis...that he gets stuck in a vending machine. Ouch! That's gotta hurt for this sexy grandpa.