When a show has resolved all the conflict and tied away every loose end, and now has nothing left to do for the tag, often they bring in End-of-Episode Silliness, a tag which has no relevance to anything. Usually a bit of random dialogue. Different from a Deus Ex Machina in that all the plot points are already taken care of. If ever a show were to have a Deus Ex Machina and a End-of-Episode Silliness, the writers would probably be smote from above. Compare Oh, Cisco.