I has a firsty!
This has a bit of a twisted end, but hilarious.
I have a cat that is way too smart for his own good. He prefers to only drink out of the kitchen sink faucet as I have a multi-stage, high powered filtration system on the cold water line, and the water does taste great. He only ever drinks from my cups of water, or will stand next to the kitchen sink and howl, cry and carry on until someone gets up to turn it on for him. This is despite the fact that I have a Drink-well Platinum cat fountain that I clean regularly. I always oblige him because I have ignored him on two occasions and both times he eventually managed to paw at the handle until he turned the water on. For obvious reasons, I do not want him to get the hang of that. So I always indulge him, and turn the water on drip so he can lick the faucet until his heart is content.
Had a good friend over once, and upon arriving asked him if he would like something to drink - "Ice water would be great" He says. So after I dispense his glass of water from the kitchen faucet, and he drinks some, guess who decided he was thirsty too. Yes, so without even thinking my friend might think it gross, I turn the faucet on drip so my boy can lick the faucet and fix his "Firsty". The look on my friends face was priceless, and it was then that I realized that not everyone might be okay with drinking after a cat.
Neither of us actually addressed the issue in conversation, although it was quite the elephant in the room. He did not touch his water after that.