30. From Ennui Enigma: Inspector Lestrade's riddle.
"What is in my pocket?"
Watson blinked. "That's not much of a riddle, Lestrade."
"Did we say riddle? I thought we said puzzle. I think that's a fine puzzle."
"Well, I don't know it's fair."
"No, Watson, I said I could solve any riddle. Let me try. It cannot be large, as your pocket isn't bulging. Nor it is alive, as your pocket isn't moving. I doubt it is your wallet or house key, as these as too straightforward. It is a receipt for your lunch, I wager."
Lestrade grinned. "Alright, alright. You win. For the record though, my wallet and keys are in my pocket, so you failed to get it all, technically."
"So neither wins," Watson concluded. "We'll call it a draw."
(Couldn't resist a Hobbit reference.)