Actually you see it a surprisingly large amount of times. We have just gotten lazy and accept it.
"I'm not telling you nothing"
"I didn't do nothing"
"There isn't nobody gonna mess with me"
And so on.
<{POST_SNAPBACK}>
Yes, but the major difference is that my double negative was for effect, rather than out of complete ignorance.
As in, I have not a lot of patience for stupid people, and therefore I'm not one to not point out their shortcomings, in a language that they may understand ...