Another iconic scene that surprised and perhaps shocked audiences at the time occurs when Tibbs is slapped by Endicott. Tibbs responds by immediately slapping him back. In a San Francisco pre-screening, Jewison was concerned when the young audience was laughing at the film as if it were a comedy. The audience's stunned reaction to the slapping scene convinced Jewison that the film was effective as drama. That scene helped make the film so popular for audiences, finally seeing the top black film actor physically strike back against bigotry, that the film earned the nickname, "Super-spade Versus the Rednecks". During the film's initial run, Steiger and Poitier occasionally went to the Capitol Theatre in New York to amuse themselves seeing how many black and white audience members there were, which could be immediately ascertained by listening to the former cheering Tibbs's retaliatory slap and the latter whispering "Oh!" in astonishment.