Ooh, look at the pretty lens flares. Want that on your profile? Well, it is pretty simple. Just use the famous Konami code (Up, Up, Down, Down, Left, Right, Left, Right, B, A, Return), but replace Return with Enter, into the the status box under “What’s on your mind?”.
This pretty neat Easter egg has been a common occurrence in some websites, like Facebook; but was popularised by the game that made it famous, Contra – where it was made to be impossible to complete since you would be killed almost every single time.
It is also a one time thing, so if you leave the page, you will have to do it again.