http://www.techtimes.com/articles/10118/20140710/halo-3-last-easter-egg-found-after-seven-years.htm
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The game has a small hidden code that was discovered by Lord Zedd, a YouTube subscriber. With the use of thumbsticks, he pressed them both while the screen is loading on December 25. To his amazement, a new screen zooms out showing a different view of the Halo ring. Probing the screen further, he sees a scrolling print on the ring with words that greet Lauren with a happy birthday.
The message struck Zedd not only because Lauren's birthday is the most popular date for birthday but also because she is said to be married to Adrian Perez, a former Bungie game developer. It should be remembered that in Bungie Mail Sack 13, Perez declared that his greatest Bungie achievement so far is when he was able to show his wife the Easter egg which he has hidden in the loading screen of "Halo 3." The egg is the same Easter egg that everybody's been scrambling to discover.