Cat Man Do,

My grey/brown tabby girl, Terra is the exact same way. She'll play fetch with the Milk Jug Ring (mjr) for hours on end. She even swats at you if you don't throw it fast enough for her tastes. Every time I get the milk out of the fridge, she's there expecting a new ring. Terra hasn't quite figured it out that every time I reach into the fridge, I'm not pulling out a new gallon.