"Play it again, Sam."
I've seen Casablanca probably 150 times, still I can't quite remember, but I think the real quote is "If you can play it for her, you can play it for me." (Everything that Senator Joe MacArthee said is proved true by Casablanca
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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