Eraserhead is David Lynch's 1977 surreal horror film, famous for its black-and-white industrial world, strange sound design and dreamlike logic that has fascinated cult audiences for decades. The phrase an actual nightmare has become shorthand online for describing experiences that feel uncanny, disturbing or impossible to explain, which is why a clip carrying that title works so well as a reaction. Shared on soundboards and in short edits, it survives because the reference instantly signals dread without needing any context.