Undiscovered Halo 3 Easter Egg?

I was reading the Bungie Mail Sack 13 and saw this answer to one of the questions:

“Showing my wife the Easter egg I put in the halo 3 loading screen for her - the one that nobody has found yet.
-Adrian Perez”

So if anyone has any ideas on this, post it here. Im always leery of a trolling Bungie employee though…

must be a hidden easter egg maybe a troll face out of the stars

I haven’t seen it yet.