head. Kindlon rigged a mechanical device that allowed the creature to move independently of the actor playing the guard. The sequence also features a stop-motion model of Aylmer that is seen eating the watchman's brain after he drops to the ground; this same model is again seen later in the film, during a shot wherein Aylmer leaps onto a man sitting in a bathroom stall. This Aylmer model was constructed using a "cold" (or unbaked) inner foam and an outer layer made of "hot" (baked) latex foam rubber. A calf brain purchased from a deli was used in the shots in which Aylmer's fluid can be seen coating Brian's brain. The electricity seen crackling in these shots was animated by Magliochetti. Using a plaster cast of Hearst, multiple models of Brian's head were sculpted for the film, as well as a fiberglass body that was constructed for the "zipper scene" in which Aylmer emerges from the fly of Brian's pants into the mouth of the blonde woman from the nightclub. A collapsible model of Aylmer was inserted into actress Vicki Darnell's mouth and filmed being pulled out; using reverse motion photography, the final footage appears to show Aylmer entering her mouth. For the subsequent shot of Aylmer exiting her mouth with a mouthful of brain matter, Bartalos sewed calf brains to a model of Aylmer, and Darnell was provided with Binaca breath spray before the take began. Henenlotter estimated that about 15 to 20 minutes of coverage was filmed for the scene. To achieve the desired velocity of the blood and brain matter gushing out of the side of Brian's head during one of his withdrawal-induced hallucinations, the effects team placed Hearst on a metal brace on an angle of about 45°, with the camera at a matching angle. After filming Hearst screaming at said angle, the crew filmed the same shot without Hearst in frame, and dumped fake blood and gore down a large piece of heat ducting; the two shots were then composited together, making it appear as though the blood is pouring out of Brian's head. The shots of Aylmer emerging from Brian's mouth on the subway were animated by Magliochetti. The effect involved Magliochetti lining up an articulated model of Aylmer with a projection of the relevant frames from the film; he then animated Aylmer frame-by-frame using stop-motion, cut the Aylmer model out of each the