When I was a kid, I used to go play softball in Central Park. One time I couldn't control myself and went out to play in Shabbos. When the ball was hit to me at shortstop. I made the play and threw it to first with a שינוי. I was thrown out for making a mockery of the game.
[I made that up.
I NEVER played shortstop. I am a lefty (leftys don't play shortstop) and usually pitched. I also never played softball on Shabbos.
As a child I spent my Shabbos afternoons learning Minchas Chinuch.
I made that up too].