Everyone knows about Treyarch's predilection for killing zombies, but it's a safe bet you didn't know about this mini-game in Call of Duty: Black Ops.
Everyone knows that Treyarch's Black Ops is going to have a zombie-killing mode. We'd know this even if it hadn't already been officially confirmed, because everybody loved World At War's Nazi Zombies minigame.
As things turn out, it isn't the only zombie-killing minigame in Black Ops. The video you see here to the right shows the (no longer) top-secret method with which you can unlock Dead Ops Arcade, a top-down arcade shooter that sees the player killing all sorts of evil undead.
This is just the opening few moments of the game, too - one can surmise that there are plenty of crazy powerups and weapons that one can obtain to kill all the zombies. At least, there better be - it's just not a zombie-killing shooter without a flamethrower.
In order to unlock the game mode, your character must break free from his restraints at the opening menu screen and wander over to a computer. At this computer, input "CD" and then "DOA" to begin your game of Dead Ops Arcade.
I hope you can play this online. It looks like a ton of fun.