This trick is no longer available on Facebook.
What's the Konami Code?
The Konami code
is a cheat code available under many games of the Konami brand.
This tradition has been passed down through generations so that application developers add features that trigger small and nice features.
All of the sites that have integrated the code are listed on this page : konamicodesites,
Please use the following (keyboard) combinations on Facebook or the Konamicodesites :
Up - Up - Down - Down - Left - Right - Left - Right - B - A - ENTER
Normally you will see a sort of rainbow (lens flare) animation on the page.