Telemarketing

I can only assume that I sound like a 12 year old girl. Every time a telemarketer calls, they inquire as to whether or not I am a decision maker in the home and when I say yes-and-please-put-us-on-your-do-not-call-list, they pause as if they don't quite believe me. I need to insert something into my standard response that 12 year olds wouldn't know about. I was thinking a short diatribe on crime rates, or how young kids use curse words, or stuff costs more these days... any suggestions?

So anyway, onto the point of this post. This evening, I received a phone call:

Her: "Hi, may I speak to David Lemson please?"
Me: "He's not here, can I take a message?"
Her: "This is Rita from the American Cancer Society..."
Me: <interrupting> "Listen, let's just cut this short, please put us on your do not call list."
Her: "May I ask why?"
Me: "I don't like getting calls from people I don't know."
Her: "...<pause>.... Um, I'm from the American Cancer Society."

What exactly did she think I meant? Ohhh, you said Rita from the American Cancer Society, I thought you said Skeeter from the American Nosepickers Association. Now that I know you're from the American Cancer Society, now I want you to interrupt me!