Johnny Knoxville surprised the crowd at the motion picture academy's headquarters Saturday by appearing on stage alongside makeup effects artist Stephen Prouty at an event honoring the makeup and hairstyling Academy Award nominees. Prouty is nominated for transforming the "Jackass" leading man into his gonzo "Bad Grandpa" character Irving Zisman. Knoxville readily admitted that the hidden-camera film featuring the 42-year-old actor-stuntman pranking unsuspecting folks as a naughty 86-year-old geezer isn't typical Oscar fare. Bad Grandpa is up against Joel Harlow and Gloria Pasqua-Casny, who turned Johnny Depp into Tonto for The Lone Ranger; and Adruitha Lee and Robin Matthews, who respectively transformed Matthew McConaughey and Jared Leto into an HIV-positive rodeo cowboy and transgender woman for Dallas Buyers Club, at Sunday's 86th annual Academy Awards.