I'm still baffled by this 'jump the shark' thing. I also think we should be careful in distinguishing between memes and instinctive responses. I would classify the cat's reactions as instinctive or a result of personal learning. Hunting behaviour might be memetic or a combination of memetic and genetic. There was a great scene in Jurassic Park II when the main bad guy got caught on the ship the were using to ship the T. rex family back to the island; the mommy and daddy T. rex had the baby in tow and one of them picked up the bad guy by the collar and dropped him alive in front of the baby, the other nudging the baby toward the petrified human. It looked just like a mama cat teaching her kittens by dropping a live mouse in front of them.