House of the Dead

SEGA's House of the Dead is a gaming institution, not because it's especially good (although it does what it does very well), but because its purposefully shaky action and dialogue makes it stick in the mind. Being chased by a sumo-sized monster? You can't possibly enter the door marked "No Entry." It's silly and harmless, and Typing of the Dead takes that idea and makes it even more outlandish.

One of the best light-gun style zombie games ever didn't even use a light gun. Typing of the Dead was a House of the Dead spin-off in which instead of aiming at oncoming undead, you instead typed a random word as quickly as you could.