Buster Keaton & Kathryn McGuire in Sherlock, Jr. (1924, dir. Buster Keaton)

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(click to enlarge)

In Sherlock Jr., Keaton’s character, a film projectionist, looks to the movie he’s showing for guidance on how to woo the woman he loves. Imitating the actors works like a charm until the film suddenly jumps forward in time. The lovers in the movie are now the proud parents of twin babies, leaving our hero quite perplexed about how to replicate that.

Scene here, full film can be seen here /here.