SALT
Can't see it here at all, but may have overlooked it.
A song based on a folk-tale rather than a joke seems to be making a comeback here in Ireland - heard it twice at a singing festival last week-end.
Don't have the words but plot goes - like- this.
Man takes job as farm-hand which requires him to live in with the farmer and his wife, both very mean, so he is not very well fed.
One of his first jobs is to kill the pig and salt it.
After some time the farm donkey dies and he is instructed to salt it for future eating.
Later the grandmother of the house dies; when he is instructed to "Go for the salt" he takes to the road.

At the same week-end I heard a song version of an American tale I know as 'The Mountaineer's Courtship'.
Old hill farmer, on his annual visit to town bargains for a wife, sets her on the donkey and heads for home.
On the way the farmer doesn't speak until the donkey stumbles and he says, "That's once" - wife says nothing.
A few miles later the donkey stumbles again; the farmer says, "That's twice" - wife says nothing.
Halfway home the donkey stumbles a third time; the farmer takes a stick and beats the donkey to death.
The wife lets out a roar, "How can you do that to a dumb animal, what's it ever done to you, how are we going to get home now, it's coming on to rain............ etc, etc, etc, etc..........
The farmer says, "That's once".
Jim Carroll