【明報專訊】"Let me do you a favour and take you out to lunch," Chadwick said. That pleased Timothy. "Wow, this cat is finally showing some sense," he thought. On the appointed day, however, the promised lunch consisted of a piece of stale cheese stuck in a mousetrap. In disgust, Timothy threw the cheese at Chadwick. "I'm happy to return the favour," he cried. To return the favour is to repay someone for something they've done for you.