Game within a game

Simply as the title suggests:
Go to the end of No Mercy (or Blood Harvest) and play until the tank comes. When it spawns, switch the difficulty to expert and let the game begin.
There is no shooting the tank and no molotovs. If there is AI players with you, they must be killed before they shoot the tank.
Be sure to have a melee weapon to attack the few zombies left and special infected.
This works best with four players, with all mics so everyone can listen when the tank is five feet from you.
If someone incaps, the others must try to pick them up.
Also, when other players die, they cannot tell the players where the tank is.
See how long you last!!

For those who are legal and do drink, this could also be turned into a drinking game. (Actually anything can be turned into a drinking game)