Boundaries and their transgression have been the main pillars of horror since its first appearance. My essay is concerned with the way the transgression between inside and outside 1 Sontag, Susan. “Fascinating Fascism.” The New York Review of Books 6 February, 1975, Date of access: 20 November, 2010. < http://www.nybooks.com/articles/archives/1975/feb/06/fascinating-fascism/?page=1> 2 The Holy Bible. New International Version Anglicised. Great Britain: International Bible Society, 2006. 5 is treated and staged in some contemporary horror movies. I shall examine the dynamics of these border crossings drawing upon the psychoanalytical concepts of sadism, aggression and pleasure. I am going to examine these phenomena through the first two episodes of the Saw series from 2004 (directed by James Wan) and 2005 (directed by Darren Lynn Bousman) drawing a contrast with Eli Roth’s Hostel 1-2 from 2005 and 2007.