Of my 4 cats, the 2 kittens jump in the litter box as soon as I take the lid off, and do their "business" with me "scoop in hand" to clean the box. They also like to annoy whoever is in the box, by climbing on top and swatting at them.

One adult cat scratches the plastic lid as much as she scratches the litter, and she gets in box looking out while she "goes".

The other adult cat, he is the best cat we have had. He never gets on the table, never scratches furniture or people, he does great in the box.