Movies you didn't know were sequels

Remakes, reboots, and sequels seem to be all that Hollywood has the ability to churn out these days. And while most sequels usually announce that they are follow-ups to other films, others brush that fact under the rug for a variety of reasons. Sometimes it's because the movie is an unofficial sequel, spiritual successor, or tenuous spin-off, but other times it's because the original movie was just plain forgettable or bad.
 
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Remakes, reboots, and sequels seem to be all that Hollywood has the ability to churn out these days. And while most sequels usually announce that they are follow-ups to other films, others brush that fact under the rug for a variety of reasons. Sometimes it's because the movie is an unofficial sequel, spiritual successor, or tenuous spin-off, but other times it's because the original movie was just plain forgettable or bad.
 
Part of the marketing push for the upcoming Judd Apatow film "This is 40" has included occasional mentions that the film is the "sort-of sequel" to Apatow's 2007 pregnancy comedy "Knocked Up." But what makes it a sequel, exactly? Stars Leslie Mann and Paul Rudd reprise the minor roles of Debbie and Pete, the sister and brother-in-law of Katherine Heigl's "Knocked Up" character. Sadly, Canadian funny man Seth Rogen — who starred in "Knocked Up" — does not make a cameo appearance in the mid-life crisis movie.
 
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