My male cat has always had a thing for knocking stuff off of high places. He loves to sit on top of our entertainment center, stare at me, knock something down and then look at me before jumping off. He does it on the counter also. I recently discovered where half my daughters blocks, sippy lid and other things have gone...under the fridge! Is there anything I can do to get him to stop? I do think it's cute...but it's starting to get annoying losing things.