I know PTIJ season is basically over, but what can I do, this is when the question was raised.
PTIJ: Why do Jews eat filtered fish?
The joke, obviously, is misinterpreting "gefilte" as "filtered." That's not misinterpreting a Jewish text, but rather a Jewish idea.
Some people seem to think that's an important line and therefore this is not PTIJ, while others think it's fine.
What's the official policy on this?