Doki Doki Panic

Also known as Yume Koujou: Doki Doki Panic, this game was originally actually supposed to be a Mario game in Japan, but it got changed to a game about an Arabian family going inside a book. This later became Super Mario Bros. 2, for the U.S. The reason this become Mario 2 was because Nintendo thought that the game made for Japan was way too hard (you can't really blame them), even though it did introduce a few mechanics that are used in some Mario games today. The U.S. version of the game actually did see a release in Japan, known as Super Mario USA.

Also, the U.S. version did use some characters which became standard in some Mario games (just look at Birdo, and the ability to play as Toad).
According to tcrf, Doki Doki Panic was originally created as an advertisement for a "Dream Factory" in Japan (That is what Yume Koujou translates into).

Typical person who doesn't know better: isn't Doki Doki Panic just a ripoff of Mario 2?

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Doki Doki Panic

1. A Japanese Famicom game that would later become Super Mario Bros. 2

2. A state of distress that occurs when a self-aware Yandere attempts to warp reality to escape her "prison" so she can have a normal, physical relationship with the person behind the screen.

1. Doki Doki Panic was America's way of flipping off Japan for The Lost Levels.

2. Doki Doki Literature Club really starts turning into a major Doki Doki Panic when Monika starts to lose it.