>>723096292
There was a glitch that let you get out of bounds during a zombie survival mini-game which allowed you to explore an empty version of the game world. The glitch was real, but the urban legend of "The Freezer" is that if you explored in the empty city long enough, the game would eventually freeze with the shadowed silhouette of person being projected on the walls. Allegedly this could brick your copy of the game somehow too.