Cat Tricks

We have a dripping faucet in the bathtub, which we never fix since both cats like to drink from it. But Ana, our female cat, has a curious habit whenever she takes a drink. She'll go up to the faucet, and she'll paw at the side of the tub directly underneath the faucet, as if she has to 'start' the drips flowing (mind you, the faucet's already dripping...). Then, after several swipes of the paw, she'll start to drink. It's a ritual, a habit, an instinct: there's no cause and effect here because when she comes up to it, the water's already dripping. But she does it every time...

Wonder where that came from?