Eating A Worm

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!