When I flushed the toilet, she stood up on her hind legs with front paws on the toilet bowl to watch the water swirl away. When it filled back up with fresh water, she stretched as far as she could to try to swirl her paw in the water. One time she almost fell into the toilet trying so hard to reach the water. I keep the down.
When I pulled the plug after washing dishes, Ember jumped to the edge of the sink to watch the water disappear. Since it's a double sink, leftover soap suds would bubble up from the drain of one sink as I rinsed suds out of the other one. Ember would leap into the sink to put her paw into the suds. As I rinsed those down the drain, too, she tried to hold them back with a paw. Once they were gone, she put her whole little face into the drain looking for the disappeared suds.
She didn't splash water out of her bowl, but every once in a while she would put her little windup chicken toy into the full water bowl. I never figured out if she was trying to give it a drink, wash it, or drown it.
She has outgrown all those things now.