our cat has got into the habit of sipping or lapping madly water out of a glass, any glass, mug etc. she seems to want to help herself to our water even if she has just had a drink of her own. i have a mug of water by the side of the bed at night and keep being woken up by her with her head stuffed in my mug :D, she also keeps waking dh up with the sound of her knocking over his large pint glass of water. infact NO glass or mug of water is safer from old snoopy draws, i have to put a heavy book over the top if i am at my laptop working as i have a glass usually by the side, she likes to jump up, sit on the keypad and have a drink from my glass. tbh i find it really heart warming although dh is strict and doesn't like it, i think it is funny :-D