When you grab the paper, the Tube Mouse will spin frantically as it tries to escape from you. When the Mouse is exposed, it dies of fright and stops spinning. Part two of the game is to make the angry human believe that the other cat did it. As established earlier, dogs are not bright. A dignified cat MAY fetch a ball for its human, but if the human persists in continually throwing the ball away, assume that the human truly does not want it, and leave it.
Any small item is a potential toy.
If a human tries to confiscate it, this means that it is a Good Toy. Run with it under the bed. Look suitably outraged when the human grabs you and takes it away anyways. Watch where it is put so you can steal it later. Two reliable sources of toys are dresser tops and wastebaskets.