When "The Purge" was released in 2013, it seemed like a cheap horror movie with a semi-interesting and fresh premise: one day a year where all crime is legal. However, you would have been safe to assume they’d make one movie, make a decent profit relative to the budget, and that would be that. Instead, we now have five films in that series. This isn’t the first surprise film franchise to spring up over the years. Here are some other examples of movies that became unexpected franchises.
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