Muscatine

One of my cats always comes when she's called...she's actually better at it than the dog. She also knows the word "bedtime." All I have to say is "c'mon, it's bedtime," and she's immediately up on the bed curled up in her favorite spot. The other one certainly knows, "do you want to eat?" LOL

I've had Siamese cats in the past who learned to chase a paper wad and would occasionally return it.

I've got a cat who plays with this little ball all the time. She would continually knock it under the china cabnet and I'd have to dig it out with a fly swatter. She got so use to this she started trying to grab the fly swatter herself. Cats are very smart.

I know one trained to sit.

I trained mine to sleep.... Maybe that's natural.