TIL moviegoers seeing "13 Ghosts" in 1960 could choose if they wanted to see the ghosts or not. The ghosts were added with a red filter on scenes with a blue filter. People were given viewers with red and blue cellophane, and depending on which one they looked through could "remove" the ghosts.

TIL moviegoers seeing "13 Ghosts" in 1960 could choose if they wanted to see the ghosts or not. The ghosts were added with a red filter on scenes with a blue filter. People were given viewers with red and blue cellophane, and depending on which one they looked through could "remove" the ghosts.

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