The couple, a leering punk nicknamed Pig (Cillian Murphy) and his obsessed girlfriend called Runt (Elaine Cassidy), are twins in all but common provenance. They were born at the same minute to different parents, move like synchronised automata, live as next-door neighbours and hold hands from their beds through holes in the brick walls. They are linked, too, by the same symbiotic folly as the couple in My Brother Tom, except that these two are such a danger to the community as well as themselves that they ought straightway to be "sectioned" and kept in separate asylums.