My friend's cats love to watch people pee. But they know that A leads to B. They love to play in the sink and know that people peeing turn the faucet on to wash their hands. His cat's really like me because I will turn the faucet on in the bathtub very lightly for them. Their owners don't go out of their way for their spoiled kitties but I'm a sucker. Another friend has a dog who will always stand vigil when either of his owners are in the bathroom. He doesn't go inside, but he always guards the door. "Master is vulnerable when he is pooping. I must guard him!"
... for some reason, every cat we have owned has tried the same thing. They wait until I am peeing, then try to look into the toilet. I'm sure you know where this is going.