not sure whether this is a repost or not, but here it goes:
go to your profile page and press:
up, up, down,
down, left,
right, left,
right, B, A,
Enter. You should be getting a lens flare mode
whenever your mouse does an action
from
http://thetracebook.blogspot.com/2010/02/konami-code.html
more facebook stuff on http://thetracebook.blogspot.com