One Megg to Rule Them All
Game: Halo: Combat Evolved
One of the most elusive and difficult eggs in gaming. (seriously, there's no way to survive once you've found it). Halo level designer Jamie Griesemer coded within the Pillar of Autumn level a hidden dedication to his girlfriend Meg—who then gave a series of cryptic clues to message-board devotees on how to find it.
We won't go in to the whole thing, but some people with a whole lot of time on their hands finally figured it out. All we have to say is, we hope Jamie at least got a little Halo:Reacharound for his romantic gesture. Zing!