What is the definition of Occasionally Fear?

"Occasionally fear is like a rollercoaster ride that you don't plan for, but you still hop on because you can't resist the thrill. Imagine this: 'Even though the rollercoaster is supposed to scare me occasionally, I find myself laughing at the sight of the train lurching to life on its first descent.'"

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Or, in a darker vein: "Fear occasionally surges like an overzealous teenager, but sometimes it just wants to be left alone in a room with nothing but its own thoughts."