In college, I heard a joke that summed up Freudian theory to a tee: A Freudian slip is when you say one thing and mean your mother. This joke, referencing a Freudian theory that an unconscious thought may reveal itself as a verbal manifestation, sums up the popular idea of psychoanalysis, the branch of psychology Freud created. Popular culture often ceases at what Freud wrote in the nineteenth century, ignoring all of psychology before and after. Freud’s theories captured the popular imagination and have not given up their grip for 100 years. After all, how familiar are you with B.F.