How to enable Google Reader Ninja Mode

Google sometimes hides little nuggets in their web applications, which can often be revealed using the infamous Konami code. The Konami Code, is a cheat code that appears in many Konami video games, although the code later also appears in many non-Konami games:

Google's spam guru Matt Cutts explains how to enable ninja mode, which actually doesn’t do anything too special aside from changing your background in the left sidebar, setting all your unread items to 30 and converting your "like" button into an explosion of hearts any time you click it. Still, it's quite funny to try it out.