This is the last one, I promise
This one is my favorite: 3 on one side and 1 on the other, and you get the vanishing ball. And I guarantee you, if it looks weird here, it looks even weirder and better with the real thing.
The journal explaining why I made these: [link]Edit:
I challenge anyone with access to a Newton's cradle to try this. It may not seem possible, but I guarantee it is. There are always three balls going one direction, and one ball going the other. Don't be closed-minded
Featured here: [link]