The title of this article is a conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.
The Titanic couch gag is the eighth couch gag of Season 10.
The living room is in shallow water and the Simpsons sit on the couch. When an iceberg floats by, the couch sinks vertically like the RMS Titanic and the family clings to dear life as it goes under. Maggie resurfaces on a couch cushion moments later with the remote control in hand.