If you bought Black Ops II retail for PC, you may end up with your second disc filled with Mass Effect 2 code.
Gamers who bought Black Ops II for their PCs may be in for a nasty surprise when they try to insert the game's second disc. Due to a manufacturing error, it seems the retail version of the game has gotten mixed up with Mass Effect 2, and some of the copies of the game contain code from Bioware's space opera. This doesn't effect all copies of the game (I got away unscathed), but reports are piling up from all over the internet.
No Black Ops for you, PC gamer.
Since the two game franchises are published by different companies; Electronic Arts for Mass Effect and Activision for Call of Duty, it's strange to find the games mixed up. The most likely explanation is that both companies use the same pressing plant for manufacturing their game discs, and that this is where the mix-up occurred. Neither Activision nor EA has as of yet come out with a statement regarding the incident.
If you've received a faulty disc, there's no need to fret as long as you have a decent internet connection, of course. The game launches via steam, and if you can't install via the disc, you can simply download it instead, even if it may cause some frustration.