Clever - khôn lỏi

Whenever the neighbour came to Bob's house, Bob knew that he was going to borrow something. Once, seeing the neighbour outside of the house, Bob told his mother:
- You know , he is going to borrow something . Let me make him stop borrowing again.
The neighbour reached the door and said:
-Bob, do you use the grass- cutter ( máy cắt cỏ)  or the mop (cây lau nhà) today?
-I'm afraid-Bob said - I need both today!
-Oh!The neighbour laughed- that means you will not be able to play tennis today!So let me borrow your tennis racket!