Verisimilitude Is Essential

In fictional narration, verisimilitude is absolutely essential. A story must be consistent and must contain no event glaringly removed from the usual order of things, unless that event is the main incident, and is approached with the most careful preparation. In real life, odd and erratic things do occasionally happen; but they are out of place in an ordinary story, since fiction is a sort of idealization of the average.

H.P. LOVECRAFT