What is the definition of Periodically Fear?

"Periodically fearing the dark is like telling a joke too many times - eventually, your audience loses interest. But hey, in the grand scheme of life, it's all part of the periodic fear spectrum, and you're either laughing or cowering."

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Example sentence: "When I saw the old, creepy mansion in the woods, I decided to periodically fear the creaking floorboards and shadowy corners to avoid being summoned by the ghost of Mr. Wilt."