Cairo Station console message

In the level the Armory in Halo 2, the player can find a hidden message with relevance to the Halo fanbase.

Message
On almost every control panel in the armory, there is at least one screen with the message: CODED MESSAGE:WU 1120 REJECTED BY ADMINISTRATOR REV. PAIN MAY CONTAIN HARMFUL CONTENT. RESULTANT PSYCHOLOGICAL DAMAGE ACTION: CENSORED

"Rev. Pain" is the player name for one of Halo's creators from Bungie studios. The "Wu" likely refers to Louis Wu, the alias of Claude Errera, the admin of halo.bungie.org.