cats

Yep, we had a cat that would always go for the sink. Eventually I tried putting the water fountain away from the food, and she mostly stopped getting water in the sink.

Before I learned this, I had another cat while I still had a fish tank...I'd get home and find him on top of the fish tank, drinking the water coming out of the filter. The lid on that tank was not very solid, and I was SURE he'd fall in at some point, with disastrous results, so I got him a fountain water dish, and that stopped his fish tank escapades.