Hence the Pyramids
From an old play that focuses on the life of an Egyptian farmer.
"I will now show you the camel. This particular animal eats mud, shits bricks, and has a triangular arse-hole. Hence the pyramids."
Hence the pyramids
I found this in the New Dictionary of American Slang.
There is a donkey in Africa. He eats mud, shits bricks, and has a triangular ass-hole, hence the pyramids.