It was the kind of scene that makes you check the calendar — and wonder if Halloween came early.

As dusk fell over Salem, Oregon, thousands of Vaux’s swifts suddenly began spiraling above a church steeple, twisting into a giant, churning black cloud before plunging down the building’s chimney.

“I recognize the end of the days when I see it,” one Reddit user declared.

Another viewer apparently had seen enough horror movies to know exactly what came next: “I’ve watched enough movies to know the protagonists have to get in there immediately or we’re all doomed.”

Cue the ominous music.

The Sunday spectacle at Salem First United Methodist Church…

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