Back to the Future 1985 Zemeckis

Doc's distinctive hunched-over look developed when the filmmakers realized the extreme difference in height between Christopher Lloyd and Michael J. Fox; Fox is 5' 4½ while Lloyd is 6' 1. To compensate for the height difference, director Robert Zemeckis used specific blocking where the two often stood far apart at different camera depths. For close ups, Lloyd would have to hunch over to appear in frame with Fox.