Bungie vs World
From Halopedia, the Halo wiki
Bungie vs World was a temporary Halo 3 playlist that appeared on 07/07/2009, replacing the 7 on the 7th playlist for that month. It involved Bungie Teams playing the playlist, and any team that beat them in the playlist would be given Recon Armor. In the playlist, you played on 35 community-made maps, all of which were either variants of Sandbox, or Foundry. One of the Foundry variants, named Colonnade, appeared a lot more frequently than many other maps in the playlist, and seeing as it wasn't a particularly popular map, this wasn't taken too kindly, but this is most likely due to there being many more Sandbox variants than Foundry variants.