In literature, film, and other such arts, an unreliable narrator is a narrator who cannot be trusted or whose credibility is compromised. As a narrative technique, it can be found in a wide range from
Illustration by Gustave Doré of Baron Munchausen's tale of being swallowed by a whale. Tall tales, such as those of the Baron, often feature unreliable narrators.
In the Bible, Jacob has a dream about a ladder to heaven. Having a character dream is a common device for embedding one narrative or scene within another. (Painting by William Blake, 1805)