Long time ago, back in the days of urethane dominance, we found a 3/4inch nut in a guys Cobra at the bottom of an old hole.
He swore he didn't have anything to do with it, but had previously worked in the shop, and had plugged the ball himself. He always swore somebody else must've done it after he left and before the plug had set up.
NOBODY believed his story.
A friend of mine and I once put a couple of tire balancing weights in a ball, just to see what it would do. I think we accidentaly created a ball with a PSA because this thing would flare about 5-6 inches, outhook our urethane stuff (it was an old rubber AMF Classic), and hit like nothing we had ever seen. If we had only understood what we had done....................