White weapons
From Halopedia, the Halo wiki
White Weapons is the name of a bug located in Halo: Combat Evolved. While playing the game on a Xbox 360, there are piles of dead bodies scattered in the levels before 343 Guilty Spark, with ammo and health packs. These piles of weapons are sometimes colored white on the Xbox 360. A theory for this bug is that the patch for Xbox 360 fails to load the bitmaps of the weapons. This also may be due to the fact that the game was made for the original Xbox and not the 360.
