Lots of cats love to drink from the faucet. At the shelter when we have a full house in the kitten room the funniest thing in the world is to turn the water on. Kittens come flying from everywhere!

The few who are not attracted to the sink tend to stare at the milling crowd playing with the water as if they're insane kitties. I'm guessing 'sink' is right up there with 'laser pointer'. Some go mad for it, the rest can't see what the big deal is.