Unarguably the most controversial aspect of popular video game Modern Warfare 2 (or just in video gaming altogether).
A level early on in the game, which is the catalyst to the rest of the story line, where an undercover CIA agent joins a group of Russian ultranationalist terrorists to engage in killing innocent civilians at Sheremetyevo International Airport in Moscow (renamed Zakhaev International Airport, after the prequel Call of Duty 4's antagonist).
You don't need to kill anyone to successfully complete it and at the end, you get killed after being found out that you're an American secret agent. Whilst you lie in cold blood and the Russians escape, the authorities find you which causes mass conflict on both sides of the Pacific.
In certain territories, this level is modified so that killing anyone results in instant mission failure or it has been removed completely. The level can be skipped at no penalty and no reward will be gained from successfully completing it.
Guy #1: What did you think of the No Russian level?
Guy #2: I thought the departure boards flicking to delayed was awesome.
Pussy-assed n00b on Modern Warfare 2 organising to ruin online multiplayer by inviting a player onto the opposite team, hide in a secluded area, plant tactical insertions and let one get kill the other 25 times in a row to activate their tactical nuke, so after repeating the procedure many times they can unlock a shitty rotating emblem. Once you locate them and take down the culprit yourself, the one on your team will try to attack you and they will both eventually leave the game whinging.
Guy #1: There's a nuke booster behind that cabin in the north west corner of the map, I'm going to take them out.
Rest of team: OK