Also,
and pigs might fly. Never. Versions of this sarcastic remark, indicating the unlikeliness of an event, date from at least the eighteenth century. One of the first written versions was “That is as likely as to see a Hog fly” (Thomas Fuller,
Gnomologia, 1732), and numerous proverb collections repeat the idea. For example, “Will I work for that company again? When pigs fly!” See also
till hell freezes over.