I've been having success with the "you shouldn't poke strangers blah blah blah line" My first two attempts have gotten me this far if you want to see a few examples.
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Here is my first shot:
Me: Hey you know its not safe to poke strangers! I guess your parents never taught you that!
HB 7: Well.... I figured that since you poked me first.... and I looked at ur profile... maybe it would be okay 
But just to make it "ok" let me introduce myself: I'm HB 7... and you are?
Me: Hi I'm Xeroz...But I think I'm going to call you trouble instead of Jordan because I can tell that's exactly what you are 
HB 7: lol.... hmmm.... i don't think you can fairly judge what i am... considering we've oinly just met....
So where do you go to school?
And thats where I am currently on that one. I was thinking about saying something like "How did you know I want to be a judge when I grow up...you must have really been stalking my page! blah blah blah" and answer her question and ask her where she goes...
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And the second gave me a succinct reply:
Me: Hey you know its not safe to poke strangers! I guess your parents never taught you that!
HB 7: Guess not..........:]
I'm really not sure where to go with that. I assume it's pretty open ended and looking for canned material isn't all that necessary but again these are my first two online sarges so any advice is welcome.
-Xeroz