From Lauren Bacall's New York Times obituary:
With an insinuating pose and a seductive, throaty voice — her simplest remark sounded like a jungle mating call, one critic said — Ms. Bacall shot to fame in 1944 with her first movie, Howard Hawks’s adaptation of the Ernest Hemingway novel “To Have and Have Not,” playing opposite Humphrey Bogart, who became her lover on the set and later her husband.
It was a smashing debut sealed with a handful of lines now engraved in Hollywood history.
“You know you don’t have to act with me, Steve,” her character says to Bogart’s in the movie’s most memorable scene. “You don’t have to say anything, and you don’t have to do anything. Not a thing. Oh, maybe just whistle. You know how to whistle, don’t you, Steve? You just put your lips together and blow.”