An intriguing premise is left under-developed in this lacklustre horror comedy that has aspirations towards Joe Dante and Frank Henenlotter. Ken Marino’s irritible bowel syndrome proves to be caused by a mischievous demon, who has gestated in his colon, who goes on a murderous rampage once unleashed. While it’s always a pleasure to watch Gillian Jacobs onscreen and there are laughs to be had along the way, the film’s full potential is never close to being realised and things never quite move out of first gear.