They like to sit in your sink
Even though it sounds really strange, cats love to sit in your sink because they feel comfortable. “They love running water [but] don’t necessarily like to be in the water,” says Corsun “They’ll sit in the sink for no reason.”
If you do not want your cat to do it, you should cover the sink when you are not home or socialize them so they don’t do that. “Take them down from the sink, put them down on the floor, give them a treat or extra attention. But you need to do that every single time,” says Corsun.