What, and when, was your last Freudian slip?
http://en.wikipedia.org/wiki/Freudian_slip
A Freudian slip, also called parapraxis, is an error in speech, memory, or physical action that is interpreted as occurring due to the interference of some unconscious ("dynamically repressed"), subdued wish, conflict, or train of thought. The concept is thus part of classical psychoanalysis.
Slips of the tongue and the pen are the classical parapraxes, but psychoanalytic theory also embraces such phenomena as misreadings, mishearings, temporary forgettings, and the mislaying and losing of objects.