English puzzle - how many punctually correct "had"s in a row?

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It's a popular one, so let the OOT'ers have their fun if you have seen it before. The idea is to type the word "had" as many times in a row, with correct punctuation. It does not have to be all in the same sentence.

UPDATE: The correct word order is this: John while James had had had had had had had had had had had a better effect on the teacher
Just make it correct by putting punctuation marks on it... it's a grammar whore competition! [img]/images/graemlins/laugh.gif[/img]