As I've said before, So-chan is a chewer. Supposedly this is because he didn't have access to his mother as a kitten and thus couldn't nurse. In any case, he chews everything, even his water bowls. In addition, he loves water. He enters the shower as soon as we're done and sometimes even sits in the warm pools left behind on the shower floor. It's no surprise, then, that he likes to overturn his water bowl. Resourceful cat parents that we are, we discovered that our giant Sapporo Beer glass, when kept filled with water, was too heavy for him to knock over. Putting a cat-guard beside the glass to keep young So in line also helps.