When I was in college in small-town New England in the late '90s, one year a group of freshmen became convinced that the woods near campus were haunted by a malicious evil spirit — a wraith. This upset them greatly; they reported feeling the wraith as an oppressive and disturbing presence. Practical advice such as "there's no such thing as wraiths; you are all just working each other up into a tizzy over nothing" was ineffective to relieve their upset.

Eventually, a friend of the group got a friend of his, who was an initiated practitioner of ritual magick, to send them a spell to banish the wraith. The spell was cast, and the people who had felt the wraith's presence reported that it was no longer bothering them.

Now, one self-consistent description of these events is that wraiths literally exist, and banishing-spells literally work. Another is that when people become caught up in playing out an upsetting story, bringing that story to a close within its own rules can work to end their upset.

Other possibly relevant tales:

• The Imaginary Mongoose
• The Hair Dryer Incident