Have there been any technological advances in boucey bouncy ball technology in the last decade or two? What is the most dangerous boucey bouncy ball I can buy?

Edit: I will admit 3 things.

1. I don’t spell good
2. I def forgot about newtons 3rd law of motion and that bouncy balls aren’t magic or something. They will always have less energy than I throw it with after the 1st bounce.
3. Gonna have to think of new way to commit murder. I could shoot bouncy balls out of potato cannon but that feels cheap.
4. I don’t count good either