I've discovered the website where productivity goes to die: showmenonstop.com. I've been watching kitty videos all day and it has been glorious - GLORIOUS I TELL YOU. Pretty much it takes you to a splash page where you type in anything you want to watch (kittens, raccoons, rocket launches, nyan cat, etc) and it will find video after video after video until the end of time that meets the criteria. You can skip videos by clicking on them, or pause by hitting space.

Watch at your own caution, you might never get anything done again.