The Haunted House, by Walter Hubbell begins amusingly with this introduction:

The manifestations described in this story commenced one year ago. No person has yet been able to ascertain their cause. Scientific men from all parts of Canada and the United States have investigated them in vain. Some people think that electricity is the principal agent; others, mesmerism; whilst others again, are sure they are produced by the devil. Of the three supposed causes, the latter is certainly the most plausible theory, for some of the manifestations are remarkably devilish in their appearance and effect.

Hehe.