We have water faucets that you turn on and off by waving your hand past a sensor. The cats figured it out in no time. Two of them will turn the water on and watch it. It's a good thing the have a time limit of one minute before the shut themselves off. We always keep them set for cold water because sometimes they stick their paws in the water. A couple of them will drink out of a faucet. And they are all fascinated by the swirling water in the toilet. When they come in, they know how to open doors, I flush it first and then again for the cats. One of the cats can open the kitchen cabinets. I discovered that yesterday. I heard the door banging and opened it and there was our cat named Loki inside. Our three car garage doesn't have any cars in it. It is now the cats play area. I built them a fort.