but it's true of every cat, whether I raised them from birth or they came to me as seniors. I used to think it was because I was always so busy that they weren't going miss a chance to jump in my lap.

And then there's the ones that have it ALMOST figured out: Humans use porcelain bowls as litter boxes. Here's a great big one that nobody's used. They'll be happy with me if I use it.
On the upside, bathtubs are easy to clean.