Go to the Google Reader. Hit the following keys in the below given order only. UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A You will get a ninja feature in the sidebar of the Google Reader. There is one more interesting and cool feature in this Ninja mode. Check out in this video. http://www.youtube.com/watch?v=4VduSHma--E&feature=player_embedded
That's called the Konami Code. It's a popular Easter Egg for developers to inject into programs and/or web pages. You'll find the Konami Code places you wouldn't expect it as well. Try this page on an airline web site for example.