I don't have a cat, anyone mind if I widen this out to other pets? (Well I hope no-one minds, since I'm about to do it anyway
)
My budgie is completely mad - a sandwich short of a picnic. He plays madly on the side of his cage, and if he catches sight of his foot, he will chase it around (like a dog chasing its tail). When he catches it, he will grab a toe, yanking his foot off the bars, then start squawking at his foot. When he realises, hanging from the bars by one foot, that it is his own toe in his beak and not a strange interloper, he gets embarrassed and starts preening himself nonchalently. 'What, me?'