"Preacher`s Preaching" joke

There was a boy standing on a corner selling fish.
He was saying, "Dam fish for sale, dam fish for sale."
A preacher walked up and asked why he was calling
them dam fish.
The kid said, "I caught them at the dam, so they`re
dam fish."
The preacher bought some, took them home and asked
his wife to cook the dam fish.
His wife looked at him in bewilderment and said,
"Preachers aren`t supposed to talk like that."
The preacher explained why they were dam fish,
and she agreed to cook them.
When dinner was ready and everyone was sitting down,
the preacher asked his son to pass him the dam fish.
His son replied,
"That`s the spirit dad. Pass the fucking potatoes!"