Maru the cat's box-diving video went viral several years ago, and his subsequent antics have kept millions delighted, puzzled, appalled, bemused. I am one of those millions who have watched Maru jump in and out of boxes, jump through boxes, and behave in an apparently deranged manner, all the while lashing his tail in what appears to be cat-anger.
Here is the book of the videos, giving some background, including a map of his owner's flat, and background of Maru "practising" his box sliding trick. He clearly is enjoying himself -- albeit in an apparently deranged way!