Ken Marino ("The State," "Party Down," "Burning Love") stars in this outrageous horror-comedy as an uptight office worker suffering from extreme gastric distress. Turns out it's not the stress that causing it, it's the toothy demon living in his colon. Like a shaved Gremlin, the bloodthirsty hemorrhoidal monster leaps out (of you-know-where) and brutally slaughters the sources of our protagonist's misery. But damned if he isn't a cute little bugger. The great cast includes Patrick Warburton ( "The Venture Bros."), Gillian Jacobs ("Community"), Peter Stormare (The Big Lebowski), Stephen Root (Office Space) and Toby Huss ("The Adventures of Pete & Pete"). 85 minutes R.