Source: Voldemars Puce, ‘Kinojauniba’ [A Childhood at the Cinema], Literatura un Maksla, 10 September 1982, p. 16, quoted (and translated) in Yuri Tsivian, Early Cinema in Russia and its Cultural Reception (Chicago/London: University of Chicago Press, 1998), p. 114
Text: The viewers were never at a loss for pithy interjections: they shouted, applauded loudly, egged on the heroes and booed the villains. Whenever they thought a picture lacked sound or text they did their best to provide their own sound effects. In the love scenes they would encourage a faint-hearted lover and express their approval of decisive action. When lovers kissed on the screen loud smacking noises resounded all round the auditorium and people tried to time their kisses to synchronise exactly with those on the screen. When this happened there would be laughter and applause throughout the auditorium.
Comment: Voldemars Puce was a Latvian film director. The period describes appears to cover the 1910s.