John Mellencamp angry about something? Imagine that! The burr under the Indiana rocker's saddle these days is the upcoming film "Jack & Diane" -- or, more specifically, its title. Mellencamp has issued a statement to clarify that the movie has nothing to do with his chart-topping 1982 single of the same name: "You don't hear my song in the film and I played no part in suggesting or offering this title. It's most apparent that the lead characters were named with the hope that the familiar title might resonate in some people's minds. I guess that's OK to do, strictly from a legal perspective, but riding on someone else's coattails and having a moral compass is left up to each individual."