Examined frame by frame C. H. Thigpen and H. Cleckley's film of a patient with multiple personality. Each of the 3 personalities of the S emerged in this film. A microtransient strabismus was detected and described, and its occurrence in relation to each of the 3 personalities analyzed. Eve Black, the least stable personality, exhibited 5 times as many of these strabismic occurrences as the other 2 personalities. A somewhat similar strabismus has also been observed in some films of schizophrenic patients, but has not been observed thus far in films of normal behavior. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.