More seriously… on that rare occasion I do finish (more often with Halloween/Holiday one shots, I do give them an ending. (Though I did have a Halloween tale that turned into a two-parter). Halloween stories are more often tragic, holiday stories more often happy/festive, but that’s not always a rule, I’ve had the reverse too.
Guess overall, it’s a balanced, satisfying ending I go with; a drop of tragedy, a drop of happiness; exact ratio depends on the particular story.