A silly roleplaying game of stupid cavemen, in which you can only use 18 words.
'Hey,' you say to your fellow players, 'let's jump those monkey-men and get that carcass!' Your GM wags a finger at you. 'Uh uh uh,' she admonishes. 'Use only your words.' You stand corrected. Gesturing wildly, you bellow: 'Food! Food! Go bang hairy!' The other players nod their heads enthusiastically.