 "Heres looking at you, kid" was improvised by  Humphrey Bogart (qv) in the Parisian scenes and worked so well  that it was used later on again in the film. He originally used the  same line in _Midnight (1934)_ (qv). It is also rumored that during  breaks, Ingrid Bergman (I) (qv) would play poker with other cast  members. Since she was still learning English, Bogart would  occasionally watch the game, and he added "Heres looking at you" to  her poker repertoire.