In A Tale of Two Sisters, during a seizure, a woman happens to see something (someone?) under the sink, and she tells her husband about it.
We later see a hand come out from under the sink, but due to the nature of the movie (a very unreliable narrator), we can't easily know for sure if the hand was real. However, we have no reason that I know of to distrust what the first woman saw. Was there a tie in with the rest of the story somehow? Or was this just a red herring?