Aficionados might have known what the movie was as soon as they heard the score — a flutter of flutes followed by doom-announcing horns.
Others figured it out when the camera panned up a woman's face as her eyes opened wide in horror.
But for most of the crowd at Secret Cinema, it wasn't until the word "Vertigo" expanded across the screen that they realized they'd be watching Alfred Hitchcock's 1958 thriller.
These days you can watch a trailer online, read critics' reviews on your phone and get a score from Rotten Tomatoes. It's almost hard not to know a lot about a movie, sometimes even before it opens. A small but growing number of people, however, are choosing to get their entertainment another way: by surprise.
Two Twin Cities series offer monthly movies followed by expert-led discussions. Both withhold the titles of the movies. Talk Cinema shows contemporary films that haven't been released in the Twin Cities. Secret Cinema shows classics.
The mystery is the appeal, fans say, because it leaves space for them to form their own opinions.
Film critic Harlan Jacobson started Talk Cinema in 1992 as a way to give audiences the kind of pure experience he got when he'd see a new film debut at a festival.
"There's no buzz, there's no advertising campaign, there's no marketing campaign, all of which are abstractions of what the marketeers think will sell the movie to most people, as opposed to what the movie may really be about," said Jacobson.