There's a cool Easter Egg in Google Voice Search: if you say "Up, Up, Down, Down, Left, Right, Left, Right", Google will answer: "Cheat mode unlocked, unlimited free Google searches". This is the Konami cheat code originally used for Nintendo games.
You can try this Easter Egg in the Google Search app for Android and iOS and in the Google Search site if you use Chrome for desktop.
The Konami code was also used as an Easter Egg in Google Reader, Google Docs (create a new document and press "Up, Up, Down, Down, Left, Right, Left, Right", then type ba and press Enter), Play Games and even for the Chromebook Pixel.
{ via Search Engine Land and Pierre Far }