For the past few weeks now, Groucho will not drink from his water dish. He'll sit and watch as we empty the dish, clean it, and fill it with fresh water but when we put it down he refuses to drink from it. He runs back to the sink and licks the water off the faucet. When he does this, he's immediately taken to his water dish but runs straight back to the sink. Granted he is a bit spoiled. We change his water frequently to keep it reasonably fresh and keep taking him from the faucet to his dish hoping he'll get the idea. Any thoughts on why he's doing this and how we can break him of it? No detergent is used on his dish, only clear tap water and a paper towel.