Halo 2's Megg

At the last part of the level where you have to secure the bomb (scene: return to sender), you have to be on legendary with no co-op. You have to have the Thunderstorm Skull (no other skulls) active and it must be active before the 1st checkpoint. You cant die, or even lose 100% of shields, you cant revert or quit while trying to find it. If succeeded you will hear this message being broadcasted over the intercom: "Paging Megg, please report to the red courtesy phone. Meg to the red courtesy phone.". MP3s of this easter egg have since been lost to the sands of time unfortunately.