Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to throw a spitball [title] Put a small amount of saliva or vaseline on the baseball. [step] The object is to create resistance and a change in the uniform weight of the ball to make its motion more unpredictable and difficult to hit. There's no " right place " to put it, since the object is unpredictability, as with a knuckleball.

Ending1: [substeps] Do not use vaseline because it will likely result in smudges and splatters, but it will offer you less potential knuckle damage. If your fist is wet, then this will do. Ending2: [substeps] Alternatively, scratching the ball with a file or sandpaper can be a similarly-effective way of messing with the weight and the trajectory. It's still illegal, but it's a possibility. Ending3: You can also use ordinary household item to create resistance. [substeps] Pour enough vaseline to cover the ball entirely. Ending4: But spit a small amount of saliva into a small cup while holding the bat with your dominant hand and shaking the bat. [title] Allow the ball to fall into the cup.

Answer format: ending1/ending2/ending3/ending4