NightMare was a scareware application created by Patrick Evans in 1990.
In the Amiga Disk Operating System (DOS), when the person executes the code: "Nightmare", it will run in the background, in every 5 minute, at which point the screen cuts into a illustration of a skull, seen from its right side, with its mouth open, teeth covered in blood and a bullet hole on the back with blood leaking from it. This is accompanied by an echoing shriek and happens for a four-fifth of a second.
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NOTE: The following video contains a screamer!