It turns out that 12 Angry Men was nominated for three Academy Awards in 1958, but it lost all three to the same movie. And that movie was (drumroll please…) Bridge on the River Kwai. Okay, so if you're not a film snob or eighty years old, you might not know what that is. (Source.)

Director Sidney Lumet actually locked himself and the actors in the tiny jury room for long periods of rehearsal to help give them a sense of what it would be like to be cooped up together for hours and hours. (Source.)

Because the producers didn't have much money, and because they only needed one set, the makers of 12 Angry Men completely shot the thing in only 21 days. That's pretty decent time for any movie, let alone one of the most famous movies ever. (Source.)