Rule of Funny
From Jenny Everywhere Wiki
The “Rule of Funny” was a metafictional principle which was strongest on April Fools' Day and allowed otherwise-impossible, or at least unlikely, things to occur if the context made it funny for them to do so.
Lord Grallyx once attempted to invoke and exploit the Rule of Funny to escape his imprisonment inside a cursed demonology book and get his revenge on Jenny Everywhere, but this was reversed at the end of April Fools' Day. (PROSE: The Wiki Adventures of Lord Grallyx)