What happens in the FNAF post-credits scene?

The nightmare is far from over if the FNAF post-credits scene is anything to go by.

Does 'Five Nights at Freddy's' Have a Post-Credits Scene?

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What Five Nights At Freddy's Director Told Us About That End Credits Message And Her Hopes For A Sequel

Five Nights at Freddy's: Post-credits scene, is it scary, and what to know - Polygon

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Do you think he will have a scene or two in the movie or only a post or end credits scene? : r/fivenightsatfreddys

FNAF After Credits Scene: FNAF Movie Post Credits Scene Explained

Five Nights At Freddy's post-credits: How many are there? Do they set up a sequel?

The Flash: Post-Credits Scene and Ending Explained - IGN