Back when Bobby Valentine was managing the Chiba Lotte Marines in the Nippon Professional Baseball League, he asked his ace starting pitcher Satoru Komiyama to “make the ball shake” as an offspeed pitch.
He first tried a knuckleball but couldn’t grip it effectively. Instead, he uses a forkball grip without the use of his thumb and throws it without any spin. So in essence, it is a knuckler but thrown in a different manner. Because of the grip, Komiyama didn’t want to call it a knuckler so he named it a “shake” pitch since he was able to achieve his goal of making the ball shake. The average velocity of the pitch is 55mph and Komiyama says he can throw a strike with it about 60% of the time.
Here it is: