Way back I gave one of my cats one of those toys that’s basically a torus with a ball that rolls around the inside with openings on top to allow the cat to hit the ball around. The openings were just a hint too small for the ball to come out without any force. Anyway, I gave my girl this toy and I swear she spent over half an hour just knocking that ball around. I walked up and pulled the ball out and showed it to her and in an instant her eyes went from slits to fully dilated. She didn’t attack me though, she just yelled at me instead.