What is the definition of Johnny Fear?

"Johnny Fear is a term that's like the bad guy in a horror movie, except instead of ghouls and zombies, it's someone who instills extreme anxiety. Think of it as the super-nerd version of a creepy-crawly pet—only instead of a spider, it's a person who makes you question everything you thought you knew about your own mind."

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Now, here's a sentence that dares to pull the wool over someone's eyes: "Johnny Fear whispered the secret to the universe, and in return, he convinced his cat to start barking at the moon, claiming it was Johnny's way of saying, 'Hey, look at my new best friend.'"