The easter egg is either one of the following messages during a loading screen 1. Happy anniversary to a loved one 2. A "Will you marry me?" :3 just listen to all his clues, happens on a certain date that we wont be able to guess (anniversary date), He was showing it to a loved one (will you marry me? anniversary date) Also he seemed flustered that we took so much interest into it because it was a private thing to his girlfriend/fiance/wife! Only he knows how to activate it because he wanted to ask his GF to marry him! or he wanted to celerate his anniversary by giving hes GF a nice present in a special way! That's my theory