I almost wonder if using your laptop on the toilet will void the AppleCare warranty like it does for smokers. Just think if you used your compter every time you were on the toilet. There must be some kind of bio-hazard entering your computer from extensive use while on the toilet. Just think of the keyboard. Gross.
This reminds me of a story from a friend of mine. He was a freshman at college last year and his parents bought him a brand new shiny Macbook Pro to take to school. The very first weekend he was at school there was a "gathering" in his dorm room. Somehow during that evening a girl he had just met got so drunk that she ended up urinating on his new Macbook Pro. How on earth you get so drunk that you mistake a MBP for a toilet, I don't know. It wasn't like she was getting back at him for something or anything like that either.
Anyways, she ended up paying to get it "fixed" which involved sending it to Apple and explaining the situation. Apparently they've heard it all before and it was nothing new to them.
Now if it was me, I don't think I would have made her "fix" it, I would have given it to her and made her buy a new one for me.