dd4's "double negatives" driving me nuts

[MotherGoose]

I am thinking this must be some speech developmental phase because my dd4, who speaks very well, has within the past few weeks begun saying "I don't have no..." and things along that line. I don't know what she said before this began, but I figure it must have been grammatically correct because I don't remember it. I correct her, and have her say the correct thing, but it drives me to distraction. Anyone else experience this? She's not around anyone who speaks that way, so I don't know where she might have learned it.

[Mrs Mungo]

Did she pick it up from tv or a movie?

[MotherGoose]

I don't think so, doesn't watch much of that but you never know.

[southwind]

Can't remember back that far as to whether or not my kids did that, but here's what I would do. I'd get a couple measuring cups or something out of the counter and then do a demonstration of what is left when you use one negative, and what is left when you use a double negative. And then I would make it into a game -- every time she used the double negative -- I don't have no -- I'd reply, "Then you DO have some!" and just try to keep things light. When my kids were little, I tried to use every single minute for teaching (I didn't, obviously, but there were an awful lot of teaching opportunities).