Flumph

The flumph is a monster found in the Dungeons & Dragons fantasy role-playing game, largely considered to be the most ridiculous creature ever created for the D&D game. A flumph resembles a tortoise-sized fleshy coin with tentacle-like legs, and if it is flipped onto its back it is completely helpless. (Later versions reimagined the flumph as a kind of aerial jellyfish.) Flumphs were introduced in the Fiend Folio monster sourcebook for D&D 1st Edition, a book infamous for its many ill-conceived contents, and were (for some reason) converted for D&D 2nd Edition rules in the Monstrous Compendium Annual Vol. 2 and to D&D 3rd Edtion in the fan-published Tome of Horrors. Flumphs are sentient, and are (trivia fans take note) the only Lawful Good creature in the original Fiend Folio.