Iain Reid’s internal, metaphysical, and reality-twisting debut novel, I’m Thinking of Ending Things, was the obvious source material for internal, metaphysical, and reality-twisting writer-director, Charlie Kaufman. Although Kaufman’s film echoes the novel’s arresting characters and haunting ideas about relationships, the human condition, and, of course, death, it is more of a faint impersonation of Reid’s novel than a true companion piece.