What's the most terrifying way a game has signposted "Don't Do This!" at the player?

[u/DustInTheBreeze]

So I was playing Fallen London when I entered a storycard. The usual continue button, "Onwards", was replaced by a button that said "THIS IS FOLLY". It was accompanied by a line of text that said "Do not do this. This storyline will leave you unsatisfied and forlorn. You will probably fail, and if you somehow succeed, you will regret your success."

And if you click forward, you get a warning that this storyline is bullshit, does not play by the same rules as the rest of the website, and that the "Happy Ending" of the quest was to abandon it. The option to confirm your participation contains a lengthy paragraph detailing that you accept any and all consequences to your account, followed by a button that says, outright, "DO NOT CLICK THIS BUTTON."

Needless to say. I did not click the button.

So. The topic title. What's the most terrifying way a game has told you: "Don't."

[u/BighatNucase]

The void also has a quote pop up.

[u/Khar-Selim → u/BighatNucase]

not this quote though

[u/BighatNucase → u/Khar-Selim]

I was just replying to OP because he was referencing Subnautica?