Text: Perhaps they didn't, because they had in mind the conclusion of Aesop's famous fable--the one about the mice who decided to protect themselves from their sly and treacherous enemy, the cat, by tying a bell around its neck.
Entailment: Maybe they didn't because they thought about the end of the story.
Contradiction: Maybe they did because they thought about the end of the story and it was too dull.