premise: Boxcar Bertha is a 1972 American romantic crime drama film directed by Martin Scorsese. It is a loose adaptation of "Sister of the Road", a pseudo-autobiographical account of the fictional character Bertha Thompson, written by Ben L. Reitman. It was Scorsese's second feature film.
hypothesis: Martin Scorsese knows Bertha Thompson.
reason: Reason:  Bertha is a fictional character.  Why: Both names are mentioned.