Imagine that you just got home from waiting hours in line at the midnight launch for Call of Duty: Black Ops II. You're ready for some fiery FPS action, except there's one little problem. The game's second disc, which is necessary for completing installation, is actually for Mass Effect 2. Wait, what?
This not only happened to YouTube user zeroiez (as seen in his video below), but Call of Duty fans on Steam, 4chan, Reddit, and those on the Black Ops 2 forums have reported having the same issue with the PC version of the game as well.
A simple (and rather lengthy) fix is to install the entire game digitally with the included Steam key. But that's beside the point. It's mind-boggling how something like this happens, especially considering how Call of Duty is published by Activision and Mass Effect by EA.
No comment has been made by Activision so far.