The Word "What"

When someone tacks the word what onto the end of a question, it should stand alone as its own question. ...Was it given to you as a gift? What? ...Were you there alone? with someone? What? ...Did the company have benefits? profit sharing? What? When someone turns a "what" question around, punctuate it just as you would the question in regular word order. This is just "bad grammar/good punctuation." ...What was it? A Toyota? ...It was what? A Toyota? ...What was her name? ...Her name was what? Happy punctuating! Margie