books by Frank Miller; Quentin Tarantino guest-directed a scene. During production in 2004, Rodriguez insisted Miller be credited as co-director, because he considered the visual style of Miller's comic art to be just as important as his own in the film. However, the Directors Guild of America would not allow it, citing that only "legitimate teams", e.g., the Wachowskis, could share the director's credit. Rodriguez chose to resign from the DGA, stating, "It was easier for me to quietly resign before shooting because otherwise I'd be forced to make compromises I was unwilling to make or set a precedent that might hurt the guild later on." By resigning from the DGA, Rodriguez was forced to relinquish his director's seat on the film John Carter of Mars for Paramount Pictures. Rodriguez had already signed on and had been announced as director of that film, planning to begin filming soon after completing Sin City. Sin City was a critical hit in 2005 as well as a box office success, particularly for a hyperviolent comic book adaptation that did not have name recognition comparable to the X-Men or Spider-Man. He has an interest in adapting all of Miller's Sin City comic books. Rodriguez released The Adventures of Sharkboy and Lavagirl in 2005, a superhero-kid movie intended for the same younger audiences as his Spy Kids series. Sharkboy and Lavagirl was based on a story conceived by Rodriguez's 7-year-old son, Racer, who was given credit for the screenplay. The film grossed $39 million at the box office. Rodriguez wrote and directed the film Planet Terror as part of the double-bill release Grindhouse (2007). Quentin Tarantino directed Grindhouse'''s other film. He has a series of "Ten Minute Film School" segments on several of his DVD releases, showing aspiring filmmakers how to make good, profitable movies using inexpensive tactics. Starting with the Once Upon a Time in Mexico DVD, Rodriguez began creating a series called "Ten Minute Cooking School" in which he revealed his recipe for "Puerco Pibil" (based on Cochinita pibil, an old dish from Yucatán), the same food Johnny Depp's character, Agent Sands, ate in the film. The popularity of this series led to the inclusion of another "Cooking School" on the two-disc version of the Sin City DVD where Rodriguez teaches the viewer how to make "Sin City Breakfast Tacos", a dish (made for his cast and crew during late-night shoots and editing