My kittens often teeter totter on the side of the box. Or put three legs up and one down. It is quite the site. They usually cover it up but if one forgets, the next guy in the box usually takes care of the problem. I think these two might be good candidates to teach to use the toilet but I just can't bring myself to sit on a seat that is used by dirty little cat feet too. I don't mind sharing most things in my house, with my kittens, but the toilet? I don't think so!