A box, cats? Really, a box? A tray? A pan? Can't you crap in a large half-circle with water and pipes that lead to a giant underground vat of shit, like us civilized humans? But no, you have to be different, unique, and special, and what says, "I'm as unique as a snowflake or DNA" better than doing your bathroom business in a box? Congratulations, kittens, you officially are different from any other animals or humans in your house, because you know what? We won't crap in a box. We just won't, because then we'd have to hear things like, "my new shoes were in that box" or "that's where I keep all my credit card info" or "you did what in my jewelry box!"
(flickr photo She's getting big.. by faeryboots; http://www.flickr.com/photos/faeryboots/2870079397/)