So-called final outing for Johnny Knoxville and his daring, stunt-hungry pals might be close to a greatest hits reel, but there are enough laughs to warrant the nostalgia The boy-men of Jackass , a three-season MTV comedy-stunt show turned periodic and beloved film series, have shown a willingness to engage in all manner of rectal probing in the name of shock laughs. (Perhaps most famously, Ryan Dunn, who died in 2011, inserted a toy car into himself before going in for an X-ray.) So it’s poigna