I tried this and it makes a cool lens-flare kind of effect, in lots of colors, and it moves.
On any Facebook screen press: up, up, down, down, left, right, left, right, "b", "a", ENTER. -- Then start typing in any text box or scroll up and down the page! (Refresh the page to cancel the effect)
Edit: check out the comments below.
walkinthenight and
sarianna pitched in
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