Here are some examples:
Daddy says "Here let me put some sweet potatoes on your plate for you"
Matthew says "Oh, no gank(thank) you Daddy."
Mama says "Time for a nap"
Matthew says "No gank you Mama. I too busy."
Matthew cries and throws a fit about not getting something he is sure he can't live without , and just before he gets into trouble he says through his tears "Oh sorry, Mama".
Well, of course, he doesn't really get his way just because he is polite, but I still like to hear it!