"Now, children," said the visiting minister who had been asked to question the Sunday-school, "with what did Samson arm himself to fight against the Philistines?"
None of the children could tell him.
"Oh, yes, you know!" he said, and to help them he tapped his jaw with one finger. "What is this?" he asked.
This jogged their memories, and the class cried in chorus: "The jawbone of an ass."