This trick might be one of the most popular Facebook hidden tricks. It is said to be a Konami code that makes red blurry circles on your Facebook page.
1)Login to your Facebook account.
2)Using the arrow and letter keys on your keyboard press:
Up, Up, Down, Down, Left, Right, Left, Right, B, A, Enter key, up, down
3)Now, whenever you click somewhere on the page, “magic circles” will appear. Click further away from the center to magnify the effects.
To get rid of them simply reload your page. It is really a fantastic “cheat” on Facebook.