carrot99 ... spot on 'methinks'. Not looked up Exodus, but seem to remember it being credited to Moses - leading The Israelites through the Red Sea. I think it also featured in "Joseph and his Amazing Technicolour Dreamcoat". But that's the same story, almost! Mentioned it before "When the Legend becomes the Truth; Believe the Legend' !!
Mum used to say "Corn in Egypt" I think it was when something unexpected turned up.
If I asked what was for tea she would say " A jump of the door and a bite of the latch"
Not a family phrase but my father in law was very bandy legged. When my mother first met him she said.......Jeez....he wouldn't stop a pig in an entry would he?