Dad's story about a kitten

One of the kittens was lying on its stomach, sprawled out on a throwrug. Suddenly, the cat attacked the rug! Grabbed the rug on its edge and bit, and kicked with the hind legs. Somehow the kicking drew the cat under the rug, whereupon all kicking stopped. The rug became a featureless rug again, with the exception of a lump under it. The lump wiggled and moved, and the rug slid across the floor. Moving about somewhat aimlessly, and occasionally the tip of a cat tail would appear from under the rug.