Sheldon, my tuxedo cat, loves to stare at drains. It makes me laugh every time he does it. He takes it very seriously though. When he stares at a drain, he’s totally focused on that drain and whatever is happening with it. He sits there motionless but from time to time cocks his head from side to side, as if pondering why. Sometimes he’ll even tentatively extend a white-mittened paw toward it, but if there’s water there, he quickly moves it away, flicking the water off. But his intent focus remains. His eyes never leave that drain.
I love this video of a Bobcat growling at a bathtub drain.