The title of this article is a conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.
The Theatre couch gag is the first couch gag of Season 10.
Similar to the couch gag in Marge vs. the Monorail, the living room is filled with supporting characters from the show. Unlike "Marge vs. the Monorail," the living room is now a movie theater and the Simpsons are shuffling their way through to find a seat. After they sit down, Homer leans in and eats from the Comic Book Guy's popcorn tub.