Additionally, sometimes pitches are used to setup other pitches later in the game or at least get the batter thinking too much. If the batter happens to swing and miss, all the better. I remember in high school, even though I was very successful, one of my coaches taught me a knuckleball. I asked him why he wanted me to learn it and he said that I should just throw it a couple times during first inning warmups or maybe once to a batter in that inning. That way, the other team sees I have it and will start thinking about it. Even if I never throw it the rest of the game, it will be in their head, decreasing the chances of them guessing my pitches correctly. I know there's a big difference between high school and the pros, but I thought that was a fun example.