Clever

Whenever the neighbour camr 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 or the mop today?
I am 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!