I have been gone for too long

Dad: Ryan, do you want a martini?
Ryan: Sure.
Dad: What about you, [Ryan's sister]? You want one?
Sister: No, thank you.
Dad [to Sister]: I got the recipe out of your Mixology book.
Ryan: Is that like a bartender's book?
Sister: Yeah. Just tells you how to make all kinds of drinks. It's pretty nice. Has sections for all kinds of different liqours, what you can make with them. Sometimes the drinks have stories.
[long pause]
Sister: But what I really want is for someone to teach me how to make crack.
[longer pause]