There's no denying that even the most modest Hollywood production tends to require the services of literally hundreds of on-set personnel.
As a result, and in an age where everyone has a high-quality camera in their pocket, it's becoming increasingly tricky for filmmakers and studios to keep the lid on their top-secret projects.
After all, Avengers: Endgame's time travel twist was known months before Avengers: Infinity War even came out due to some sneaky leaked set photos, and as long as fans are aware that a movie is in production, they're always going to be on the lookout for a scoop.
But what if they don't even know the movie is being shot?
That's the ingenious tactic pulled by these 10 films, all of which were shot in complete secrecy, with their existence only being confirmed once principal photography had been completed.
Hell, in a few cases audiences weren't made aware of the movie until post-production was basically done and it was just a month or two away from release, serving as a testament to the cast and crew's commitment to keeping schtum.
In an era where huge movies are endlessly hyped for potentially years before finally coming out, it sure is refreshing that these films came together before anyone even knew about them...
Stay at home dad who spends as much time teaching his kids the merits of Martin Scorsese as possible (against the missus' wishes).
General video game, TV and film nut. Occasional sports fan. Full time loon.