A wonderful graphic, ‘quoted’ by Seb and repeated here so I can find it again:

The first time I can remember hearing the phrase “Pigs Might Fly” was in Kind Hearts and Coronets, as memorably mouthed by Glynis Johns. It would be enlightening to collect such bits of eidetic imagery and phraseology… I woke this morning thinking of the phrase “You’ll eat food from sawdust” that accompanied a 1950 Popular Mechanics article on the World of the Future.