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First of all it's important to note that the spitball is an illegal pitch. Any pitch that
places a foreign substance on the ball or defaces the ball or scratches it in any way
is an illegal pitch, and the player is subject to ejection if he is caught placing a foreign
substance or marking up the ball in any way. But the basic way to throw a spitter is you
place a foreign substance on the ball whether it be spittle from the mouth, Vaseline that
you've put on the bill of the cap, or an emery board that you've hidden in your back pocket.
All of those can be used to deface the ball to create a spot on the ball that makes it
heavier on one side and creates odd movement. But I'd like to again note, that a spitball
is an illegal pitch.