Pitcher uses Gorilla Arm

[WhiteHat Ref]

In the first game of a doubleheader, I had a pitcher using the gorilla arm. I warned him twice, then the third time I balked him. The coaches saw that I was telling him about the gorilla arm, and in fact the pitching coach was going to come and tell his player about that being illegal, and the pitcher said to his coach that he knew what he is doing wrong. But three times is a charm and I balked him. Between, innings the first base coach thanked me for telling his pitcher not to do this before I balked him. My reply to him was do you know what that is, and the coach replied "stupidity on the part of my pitcher".