Yes, ma'am. No ma'am. I ma'am.

Kate had a little trouble with saying "I am" until she was about 3 1/2. If you told her, "Kate, you need to eat your dinner," and she felt that she was already doing what you told her to do, she would respond, "I ma'am". This was probably a mutation of "I am" and "Yes, ma'am". Regardless of where it came from, it was fun to hear.