The title of this article is a conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.
The Snow Globe couch gag is the tenth couch gag of Season 9.
The Simpsons sit on the couch as normal. The camera zooms out and reveals that the living room is part of a snow globe that two hands shake to make the snow fall.(Christmas episode for this first usage)