Still from “The Human Centipede” courtesy IFC Films. Standing in line for the D.C. premiere of The Human Centipede, I was compelled to get to know a bit about my fellow moviegoers. It’s got to be a special breed that comes out at midnight to see what can be described in short as this: Three tourists are sewn together via the gastric system and made to crawl around as a reconstructed Siamese triplet by…