For Robin, my older grey tabby, if she is walking around upstairs and I come to the top of the stairs and sit down so that my head is at floor height, if I look around the corner at her, she will come to me so that I can give her a kiss on the head. This usually happens when we are running around the house together

For Lupo, my younger black and brown tabby cat, it's his ability to entertain himself. I will often find him playing with some random thing he found. Batting it around, throwing it in the air and chasing it.