I used to play this game with my cat when he would come sit on my lap while I was sitting at my desk working on the computer. I would put a plastic bottle cap on the edge of the desk and he would immediately tense up, but he played it cool for a few minutes and acted like he didn’t care about the cap. Then suddenly the paw would fly out at light speed and knock the cap to the floor. Rinse and repeat like ten times in a row or more.