Cup ball and wall ball. My favorites
When I take my son to the ballpark for my step daughters softball games, I always have an extra tennis ball in the car to give him to go play with. He takes off and I don't see him until after the game.
Good times...
When I was a kid going to the high school games my Dad would look at my filthy clothes where we had been playing cup ball, wally ball, and kill the man with the ball behind the bleachers and comment, "Looks like the better game was on that side of the stands." And he was probably right.