De moviemistakes.com :
Some say it refers to the Boston Red Sox winning the World Series in 1918, others say it refers to winning World War II (refering to the "We win!" headline of newspapers), and there are more random suggestions too. But there is no definite answer to it.
De IMDb -
The images were taken from old archives of photographs, and then treated to look older. The entire sequence was created by Castle/Bryant/Johnsen, Inc. An original, untreated photograph can be seen here: http://www.shorpy.com/node/7798. The newspaper headline "We win!" refers to the ending of prohibition.
Existem muitas perguntas semelhantes em toda a Internet, mas não há resposta fornecida pelos funcionários.