“Who’s afraid of a couple of gay cowboys? Not moviegoers, who helped Brokeback Mountain post the highest per-screen average over the film-flush holiday weekend, reports Newsday‘s Sandy Cohen. “The Ang Lee film, which follows the 20-year forbidden romance between two roughneck ranch hands, earned $13,599 per theater, compared with $9,305 for weekend winner King Kong and $8,225 for The Chronicles of Narnia: The Lion, the Witch and the Wardrobe.” If only Cohen didn’t quote box-office interpreter Paul Dergarabedian so much. What’s wrong with that? To explain I have to move on to another item…