Why is our water bill so high?

My cat Ringer used to like watching the toilet flush when he was younger. He actually scared a guest when he tried to follow her into the bathroom so that he could watch it flush when she was done. As far as I know, he never learned to consistently flush the toilet himself, though I suspect he managed to do it himself at least once (we heard the guest toilet flush, but all humans were present and accounted for. We went into the bathroom to find Ringer watching the water swirl). Now if you could just combine this talent with training the cat to use the toilet instead of the litter box.