Theaters in Hitchcock movies, page 2
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Stage Fright (1950): curtain-raising credits, climax on stage
Behind credits, the curtain opens on London where the action begins.
villain caught by falling curtain

I Confess (1953): killer trapped in theater
The Man Who Knew Too Much (1934 & 1955):
concert at Royal Albert Hall

Bernard Herrmann conducts
An assassination is planned at the cymbal crash
Torn Curtain (1966): climax at the ballet
The ballerina onstage spots the fugitive hero in the audience.
"FIRE!"
theaters page 1 - page 2