Chuck Palahniuk, 7pm, $35 Sundance Kabuki Cinemas - 1881 Post The outer reaches of porn are a little hard to fathom. Splosh films? Furry fetish? 2 Girls 1 Cup? (Wait â" forget about 2 Girls 1 Cup.) Fortunately â" or maybe not â" Chuck Palahniuk makes the world of world-record gangbanging a little easier to swallow with his new book, Snuff. Using first-person alternating narratives, he gets into the heads of three of the 600 people awaiting their shot at Cassie Wright, aging porn star, who is