Levi and Charity (siblings) play this way at least once a day -- Levi actually likes to get his little teeth into Charity's thicker coat and just clamp down, while Charity hangs out in the kitty bed trying to sleep through it all! They often roll and grab one another, their feet doing the bunny kick at one another. It does seem like "extreme sports" for cats, but they seem none the worse for wear and they'll often groom one another before or after their little "dance." I used to wonder if they didn't like each other anymore, but now I realize they play this way probably because they love each other like crazy! They feel safe enough together to do this kind of "over the top" chasing and catching! Bonnie (the self-annointed "Queen") is not usually as interested in this play, she'll hiss, swat, and move away, whereas "commoners" Charity and Levi really engage one another and tumble about for quite a while.