A short short story that I read in an anthology many years ago. The Devil is sitting in his office? throne room? with one of his minions. They are discussing the state of the humans coming to see him, asking for wishes in exchange for their souls. The Devil is concerned that no one asks him the Ultimate Sacrifice (or something like that). It is implied, as I recall, that it would mean the End. His minion reassures him that the human is harmless. Big mistake:
The man asks that without any change to himself whatsoever, he become the most despicable or lowly human on the planet. The Devil screams.