Write a story about a person who can see ghosts, but only when they're wearing a certain hat.
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Billy was a mostly ordinary guy with an odd quirk—he could see ghosts, but only when he wore his favorite old red baseball cap. Whenever he put the cap on, ghosts would become visible to him, wandering around and going about their spectral business. The ghosts were often startled to realize a living human could suddenly see them.

One day, Billy lost his precious red cap. He tore his house apart looking for it, to no avail. Without the cap, the ghosts disappeared again from his view.

Just a week later, Billy was at the park and saw his cap sitting atop the head of a disheveled older man sitting on a park bench. The man was talking and gesturing quite animatedly, but there was no one else around. Billy realized with horror that this man could also see ghosts, but only with the magic cap—and now he had inadvertently stolen the man's ability to see the spirits he had clearly come to know.

Billy sheepishly approached the man and asked for his cap back. The man flew into a rage at being interrupted. But then he noticed with shock that he could no longer see the ghosts he had been conversing with. He looked at Billy wide-eyed and reluctantly handed the cap back. "Take better care of this," the man growled. "Do you have any idea the trouble you've caused?" With that, he stomped off, lamenting the loss of his ghostly friends. Billy slunk away, embarrassed, vowing to never lose the cap again.
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