Little Johnny sat playing in the garden. When his mother came out to collect him, she saw that he was slowly eating a worm. She turned pale.

"No, Johnny! Stop! That's horrible! You can't eat worms!"

Trying to convince him further, "Now the mother worm is looking all over for her nice baby-worm."

"No, she isn't," said Johnny.

"Why not?"

"Because I ate her first!"