Oh boy, what is a giant screw up on Activision's part. Call of Duty Black Ops 2 released today, but people who bought the game in a retail box received a little surprise. After installing the first disc onto the computer via Steam, you will be prompted to insert disc 2 (2 discs). When disc 2 is inserted, the installation would not continue. Instead, you would find out that Mass Effect 2 data is on that disc. This is strange because the disc still has the Black Ops 2 image mounted on it. Activision has not commented into full depth about the situation, but is trying to figure out why this has happened. As for the PC gamers who bought the game via retail, you may be out of luck. For those who bought it digitally, you lucked out. Further news will be provided with responses from Activision.

Source: http://www.ign.com/articles/2012/11/14/mass-effect-accidentally-included-with-black-ops-2

lolol? How did this even happen?  They don't have the rights to ME2!

Wtf, now this could turn out interesting

I was told that bioware is giving everyone who had this issue a copy of all three mass effect games... Said something along the lines of "the universe was telling you to play the series" or something!

EDIT:

here's the post from bioware:

http://blog.bioware.com/2012/11/13/were-answering-the-call/

Yup Tay, I saw that too. They only gave out 50 copies if you provided a pic of your disc. People probably got them all.

This is my favorite game... Always.