Sever

Sever is an R-rated horror film that was shown at the Aztec Theater. True to the title, the movie's poster depicts a severed head.

History
After Bart acquired 's cell phone, Marge took it away from him, but gave it back after she activated the phone's tracking chip. Not realizing he was being monitored, Bart snuck into the Aztec to watch Sever.

In the scene from the movie that was shown, the villain was holding a bloody cleaver and advancing on a hapless female victim. Just then Marge, alerted to Bart's location by the tracking chip, burst into the theater and dragged Bart out, covering both his eyes and her own from the on-screen action.

Behind the Laughter

 * From the genre and title, Sever is likely a parody of the  movie series.