The ability of a human to be induced into a form of behavior or thinking pattern after coming out of the hypnotic state.
Post hypnotic suggestions are administered by the hypnotist and may optionally include a time scope. An altered sense of perception or behavioral pattern may be "programmed" into the person under hypnosis. Certain sequences of events may be set as triggers to enter or exit the post-hypnotic pattern. The behavior patterns resemble conditioned reflexes, though administered without classical behavior alteration techniques.
An episode of MythBusters tackled the subject of post-hypnotic suggestions. Both the subjects hypnotized would not do things against their will, which the experts interviewed agreed would not happen.