"Basically, you were thinking about cocks in the middle of the night," actor John C. Reilly joked with writer/director Jake Kasdan during a screening and Q&A of Walk Hard: The Dewey Cox Story (Dec. 21) Tuesday night. And so what? If that's what was needed for Kasdan to up and write (with Judd Apatow) this hilarious, far-reaching spoof of the usually lame music-biopic genre, then bring on the dicks!

The movie—it could be mistaken for a musical—focuses on the life of Dewey Cox (John C. Reilly), a farm kid who grows up to be a chart-topping musician struggling to keep his high-flying career afloat. There's the egregious drug use. There's the philandering. There's the beautiful, unprecedented ego. The film dashes through countless absurd scenarios (spoiler: children sliced in half with a machete by their own brothers) and implausibly quick plot progressions (non-spoiler: seven-year-olds learning how to play authentic blues in about two seconds), all of which deliver on the promise of its epic trailer. But as with any comedy of this nature, don't expect the world ... and you just might get it.

Walk Hard is a heroic tribute to most every significant musician of the past 50 years, from Brian Wilson to Bob Dylan, and the score is pretty much flawless. The arsenal of spot-on jokes, delivered by a stellar cast, is built—it cannot be avoided—on a towering mound of cocks, from its pun-ey title to the gratuitous exposure of a flaccid penis hanging over Cox's shoulder as he lounges in a hotel following an orgy.

At one point in the Q&A, Kasdan added, "[The film] was just an opportunity for shameless penis promotion." The crowd laughed heartily and then nervously. It could be the end of publicity as we know it, with even the marketing game serving as another chance to put your arms around dick-joke culture. Come on, give us a hug!