📜 Horror Master List
Ranks one through about twenty I'm confident in from recent evaluation. The rest are from my notes, in progress.

Suggestions very welcome!

Definitions:

Wikipedia:

"The uncanny is the psychological experience of an event or individual being not simply mysterious, but rather frightening in a way that feels oddly familiar. [....]

Uncanniness was first explored psychologically by Ernst Jentsch in a 1906 essay, On the Psychology of the Uncanny. Jentsch defines the Uncanny as: being a product of "...intellectual uncertainty; so that the uncanny would always, as it were, be something one does not know one’s way about in. The better oriented in his environment a person is, the less readily will he get the impression of something uncanny in regard to the objects and events in it."[4] He expands upon its use in fiction:

In telling a story one of the most successful devices for easily creating uncanny effects is to leave the reader in uncertainty whether a particular figure in the story is a human being or an automaton and to do it in such a way that his attention is not focused directly upon his uncertainty, so that he may not be led to go into the matter and clear it up immediately.[4]

Jentsch identifies German writer E. T. A. Hoffmann as a writer who uses uncanny effects in his work, focusing specifically on Hoffmann's story "The Sandman" ("Der Sandmann"), which features a lifelike doll, Olympia.

tate.org.uk:

The term was first used by German psychiatrist Ernst Jentsch in his essay On the Psychology of the Uncanny, 1906. Jentsch describes the uncanny – in German ‘unheimlich’ (unhomely) – as something new and unknown that can often be seen as negative at first.

Sigmund Freud's essay The Uncanny (1919) however repositioned the idea as the instance when something can be familiar and yet alien at the same time. He suggested that ‘unheimlich’ was specifically in opposition to ‘heimlich’, which can mean homely and familiar but also secret and concealed or private. ‘Unheimlich’ therefore was not just unknown, but also, he argued, bringing out something that was hidden or repressed. He called it 'that class of frightening which leads back to what is known of old and long familiar.

Closely associated with the idea of a double or 👥 Doppelgänger see link.)

Further Reading
Freud, "The Uncanny" (1919)