Call of Duty: Modern Warfare 2/Museum

This is a bonus level that is unlocked after the campaign is completed. The Museum is divided into three rooms. Two of the rooms contain display cases with every single weapon in the game, from the Cheytac Intervention to the SCAR-H to the M79 Thumper. These rooms also have exhibits from different levels in the campaign with characters that will play out a scenario from the missions for a few seconds, then freeze again. The characters (except for the hostages and scuba divers) are all armed. Each of these two rooms have a red button on the reception desks (helpfully labeled "DO NOT PRESS") that, when pressed, will immediately bring all the characters in that room to life, and they will all attempt to kill you. These characters are easier to kill before the button is pressed than afterwards. For example, a Juggernaut might take a single pistol shot to the head to be killed before the button is pressed, and when the button is pressed, might take 4-6 Intervention headshots to die.