Absurd -

Arthur lived in a town where the rain only fell upward and the clocks ran backwards on Tuesdays. One morning, he woke up to find that his reflection in the mirror had decided to quit and was currently packing a tiny suitcase.

"I’m tired of the routine," the reflection said, its voice sounding like a muffled radio. "I’m going to become a professional cloud-counter in the next dimension." absurd

What's the best, most absurd premise you've seen in a fantasy story? Arthur lived in a town where the rain