Growing up, I had a cat that loved playing with crumbled cellophane wrappers from candy and the tabs off of milk jugs.

My cats I live with now, the father likes this one toy that my fiancé gave to me. It's this mouse on a string on a stick. And the mouse squeaks. It gives him the thought that he is hunting the mouse.
The son, he is obsessed with a laser pointer. It's a flashlight and I have to click it 3 times to get to the laser. He will get into the position when he hears the first 2 clicks and go insane. I call it the Hami Squawk 350 when watching this round little cat charging through the apartment to try to catch the dot.