The Curious Case of Benjamin Gump??! :o

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Some of my friends told me that the new Brad Pitt movie (The Curious Case of Benjamin Button) had so many similarities to Forrest Gump and I am curious as to what those similarities are. I know one of the actresses in Forrest Gump is also present in The Curious Case of Benjamin Button. Her name is Taraji P. Henson (correct me if I'm wrong) But does the similarity end there or are there more to it than meets the eye? Discuss.