I'll give my cat cardboard boxes, and it will play in them and love them, and then just randomly after 5-10 days he will pee in the box. He never pees on anything else. Just cardboard boxes on the floor which he's had long enough to be confident that it belongs to him. Now we have to get rid of cardboard boxes promptly after 3 days to avoid him peeing in them :/.
I can also leave out meat on the kitchen table and he won't touch it if I leave the room, but if I put bread there and forget about it? The little guy will grab the whole baguette, take it onto the floor, and then proceed to kill it, leaving entrails of baguette strewn all over the kitchen by morning.

