Once upon a time there were many tiny ants that were hungry and looking for food. They were very busy and were looking in so many places that the housewife put out peanut butter, with sugar in it, and boric acid. The ants didn't know that the poison was there: it kept the ants busy, working hard.
The ants were so excited that they swarmed the peanut butter. More and more ants came, and slowly took the food away.
And the hidden poison in the peanut butter and sugars that the ants couldn't taste, eventually killed them.