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"Jackass Presents: Bad Grandpa" Movie Stills

Jackson Nicoll and Johnny Knoxville in Paramount Pictures' "Jackass Presents: Bad Grandpa" - 2013

Bad Grandpas: Hollywood's Worst Geezer Getups

Johnny Knoxville underneath those prosthetics and bald cap manages to fool a bunch of people in "Jackass Presents: Bad Grandpa," but we're not sold. It got us to thinking about these other stars whose makeup didn't seem quite realistic enough when aged for the cameras.   — by Meriah Doty