The Dark Knight has been subject to diminishing domestic returns ever since it opened, with a far lighter falloff than the vast majority of other films, but still no match for what Titanic did on its way to setting the all-time record for worldwide gross. Titanic didn't open all that strongly but actually increased its take on some weekends and just kept pulling in the same decent haul week after week, topping the charts for something like three straight months.
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