An internationally recognized holiday amongst all cats and some dogs, Toilet Paper Destruction Day is celebrated on a bimonthly basis. Its date is not set in stone, but often falls on the day when the humans in the house have had too much Mexican food, and are in dire need of the murdered and unusable toilet paper. It also seems to fall on days when said humans are busy as shit, with absolutely not time to deal with this fucking crap. For cats, the day symbolizes their independence from all human authority. It's believed that the toilet paper stands for the hopes and dreams of the people in the house, and thus by destroying it, the cats are making a powerful statement about their stance in the home's hierarchy.
Rumor has it that some humans have considered rebelling by instituting a litter tossing celebration, but this was stopped when they realized that only someone as rude as a cat would fuck with someone else's ability to answer nature's call.
(flickr photo Gatti e carta igienica by One From RM; http://www.flickr.com/photos/onefromrome/88751308/in/set72157594175560229/)