Aaron Sorkin ?? The Greatest Movie Line of ALL TIME Is …

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“I”ll be back” … “You can”t handle the truth” … “Dude, where”s my car” … some of the best movie lines in the history of cinema — but Aaron Sorkin says the #1 quote is straight out of the “70s.

Sorkin — the Academy Award-winning screenwriter of “The Social Network” … and the guy who penned “A Few Good Men”  … was leaving the Chateau Marmont yesterday when our photog dropped the “best line ever” question on him.

Check out the clip for his answer … but, we”ll give you a clue — here fishy fishy!