Slim: Who was the girl, Steve?
Harry: What girl?
Slim: The one that left you with such a high opinion of women? She must have been quite a gal. You think I lied to you about this don't you? Well it just happens there's thirty-odd dollars here. Not enough for boat fare, or any other kind of fare. Just enough for me to say "No" if I feel like it, and you can have it if you want it... you wouldn't take anything from anybody would you? You know Steve, you're not very hard to figure. Only at times. Sometimes I know exactly what you're going to say. Most of the time. The other times ... the other times you're just a stinker. (she kisses him)
Harry: What'd you do that for?
Slim: Been wondering if I'd like it.
Harry: What's your decision?
Slim: I don't know yet. (she kisses him again)
Slim: It's even better when you help. Uhh... sure you won't change your mind about this? This belongs to me, and so do my lips, I don't see any difference ... OK You know you don't have act with me, Steve. You don't have to say anything, and you don't have to do anything. Not with me. Ohh, maybe just whistle. You remember how to whistle don't you? Just put your lips together... and blow.
(she exits. Harry smiles to himself and then whistles)

Bogart and Bacall in 'To Have and To Have Not', from the novel by Ernest Hemingway, directed by Howard Hawks, 1944