(Let's just throw a spoiler alert up for every word in this post here on out.) The Simpsons' executive producer Al Jeans spilled many beans about next season's Treehouse of Horror to TVLine. Here they are:
Bean 1: Bart is going to go back in time to prevent Marge and Homer from getting married, like an anti-Marty McFly. Sub-Bean 1: Jon Lovitz will be back to voice Artie Ziff.
Bean 2: There will be a found-footage parody, you know like Paranormal Activity. "Strange" things are going to happen to the Simpson house.
Bean 3: Jean: “We have a segment where a mini black hole terrorizes Springfield and starts [...]