When I was kid there was a retired Major League umpire that bought a small tavern where I grew up..just wanted to get away from it all. Anyway, he would come out and ump the local team games on the weekend.
He would tell of one pro team that had a couple of pitchers that could throw sky writers-thats what he called a Knuckle ball, and when the opposing batters would come up to the plate the catcher would tell them to dig their foxhole cuz they had no idea where in the hell the ball was going.
I got to meet Tony Kubek and Clete Boyer because of that ump. They came up to visit him. Never will forget that.