Hee Hah! LOL! My Siamese used to try to drink out of the toilet, so we got in the habit of closing the lid. Often one of us would go in there and find a "masked marauder" sitting on top of the closed seat eyeing us accusingly.
We had another cat, a blue grey one who used to like to lap sit on the occupant of the potty. That was the only time we could hold her. Cats!