In the multiplayer map NUK3TOWN, if you shoot off the arms on all of the mannequins, an alarm will sound in the distance. All of the mannequins in the map will then pursue you when your back is turned and will freeze in place when you face them. This is an homage to the Weeping Angels from the Doctor Who series, at which an enemy in the show that pursue people in the same manner.
Contributed by Pogue-Mahone