My cat started this habit when my faucet leaked in my apartment during college. I told the land lord and he didn't fix it, he paid the water bill and the cat loved the dripping faucet it was a win win situation. That was until I moved and won't let the faucet drip for her all day. I know I am a mean mean mean mom. She tells me all the time when I won't turn it on. It has been over a year but she will still beg and plead for me to turn the water on.
Her newest is to drink the bath water when I am taking a bath. She just moves the bubbles out of the way :)