Nonexistent game which people keep mistaking for Call of Duty: World at War.
If anything, Modern Warfare 2 should be named Call of Duty 5, but Infinity Ward decided not to name it that, it's Modern Warfare 2 instead. Therefore, Call of Duty 5 isn't applicable to Modern Warfare to either.
SO, there is no such thing as Call of Duty 5.
Gary: Hey John, wanna pwn some noobs on Call of Duty 5?
John: For the last frickin' time, Gary, there's no such thing as Call of Duty 5!!! It's World at War, or WAW.
Gary: COD5 IS World at War, and who says WAW anyway? Sounds retarded.
John: It's short for WAW, better than saying 5, because THAT's even more retarded. Now just for that, no I will not play WAW with you. Go away.
Brandon: Hey Marcus, I'm buying COD5 soon.
Marcus: OMG, what is wrong with people?! There's no such thing as Call of Duty 5! WAW isn't 5!!!!!
Brandon: Who said anything about WAW? I'm talking about Call of Duty 5: Modern Warfare 2!!!
Marcus: What?! Oh lord, just get away from me!!!