We've got a wacko cat (is there another kind?) named Possum. Gray, ugly, long tail, pink nose and here long before M'cat. Anyhow, Possum will sit, sit up, or roll over for the little plastic pull tab which secures the top of a fruit juice container. It's her favorite toy. Possum knows the sound of me shaking up the fruit juice before I open it and comes running and howling in anticipation of her toy. Sometimes she's interested in licking the top, but she's usually too blissed out murdering plastic to care about food or drink.