Borderlands 2

Borderlands 2 is the sequel to space cowboy romp Borderlands, which despite it being crammed full of Internet fandom references to the point of hand wringing embarrassment, is actually a major improvement on the first game. This game, you're now up against Handsome Jack, the megalomaniac head of the Hyperion arms company; as well as the now ubiquitous 'psycho' bandits.

Unused Weapon Advertisements
Alongside radio advertisements for the guns & arms companies used in game, all of the arms companies have a full set of files that fit perfectly with the vending machines. However, in game they go unused, as Marcus Kincaid is the only person to own the vending machines.

Whether or not each company was to get its own vending machine isn't clear - but with this said, the Torgue files are used for the "Mr Torgue's Campaign of Carnage" DLC, as Mr Torgue does have his own vending machines.

Unused New-U Audio
Handsome Jack was also supposed to deliver sarcastic lines to the New-U respawn stations. Instead, it's a generic female voice, which to be fair, isn't any less sarcastic.

Unused Mechromancer death scream
The Mechromancer class has an unused death scream in which she appears to be screaming "titfuck".



Missing Textures?
In the Caustic Caverns area, there is a missing texture for the inside of the mine shaft's crusher. The texture is the default chequerboard used by the Unreal Development Kit.



Debug Menu
Borderlands 2 contains references to the debug menu inside of its configuration settings, though it's currently unknown how to activate the debug menu itself.