A difficult one... from which year is this dialogue from:
[Lil sis, an underage girl, is about to leave arm in arm with Beau to 'show him around' when older sis intervenes]
Older sis: You're aware of his reputation, aren't you?
Lil sis: Oh, I love dangerous men... besides, I can always scream for help.
Beau: Wait a minute... let me hear you scream.
Lil sis [inhaling deeply, filling her lungs]: ...eeek... (barely listenable)
Beau: It's that the best you can do?
Lil sis: I'm afraid so.
Beau: And sometimes you lose your voice entirely?
Lil sis: Oh yeah!
Beau: Let's go!
ballpark estimates accepted ("early 1970s" for example)
Bonus points for those who identify:
The movie title
Who's playing the 'beau'
Who's playing the 'little sis'
Game ends after the first 10 replies with answers.