Folks over at The Simpsons take Halloween very, very seriously. Every year, they come up with "Treehouse of Horror," a TV special composed of three special Halloween episodes that usually parody famous horror, sci-fi, and fantasy movies and TV shows. If you’ve yet to watch one of these highly anticipated specials, this couch gag (that's TV lingo for this show’s trademark opening credits), created by award-winning director Guillermo del Toro, might just convince you to tune in this year. Can you spot all the movie and TV show references?

(Screencap via YouTube)