Close Encounters of the Third Kind

This sci-fi adventure follows a group of alien enthusiasts who are attempting to contact extraterrestrial beings. The Steven Spielberg movie was released in 1977 to much fanfare. Since then, it's accrued nearly $400 million.
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Memento

Christopher Nolan awed audiences with this 2001 film. The neo-noir psychological thriller film has grossed around $35 million in the last 20 years. Critics commented on the complicated plotline with very little plotholes, which was impressive since the film followed a man with severe memory loss trying to find out who had killed his wife.
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