Activity design for teen drug free program...?

I am supposed to be giving a presentation to a group of teenagers about drug abuse. I need some design for activities that I can do with them...I don't want to just stand in that and talk at them...I want to be able to get them interacting near me...doing something fun, that they'll remember. I'd also like to show them some videos if you know where I can find any appropriate ones...you know, "real people, real stories" helpful of videos.

All help is appreciated. Just so you know, I really didn't know what category to put this question contained by...I was hoping that some other teens, and even parents could help me out. Thanks!
Answers:    -Interview people that have been on drugs and now are drug free.
and

-Tell them about adjectives that bad things that come with sex addiction,needing money no choice but to steal prostitute etc.

-and interview a entity whose on drugs tell them how they fell when they have no drugs.

-list the dangers of it.lungs cancer brain weaken etc.

-do posters like saying about that drug and what it cause.
get steveo's document, steveo's demise and rise, if you can. its deep and shows what drugs can do

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