"Words of great Emphasis are also Set in Italick, and sometimes begin with a Capital Letter: If the Emphasis bear hard upon the Word to be exprest as well as the Thing to be exprest, it ought to begin with a Capital. I shall bring for instance an Observation I made above forty years ago on the Word that, viz. that that Word may be reitterated five times, and make good Sense: If it be set thus it will seem nonsense, that that that that that; but if it be Set thus, that that That that that Man would have stand at the beginning of the Line should stand at the end; it will, by toning and laying emphasis on the middlemost That become good Sense. Now all the thats ought to be Set in Italick, and the middlemost That ought to begin with a Capital, because it is both the Thing and Word."

Thus Joseph Moxon in Mechanick exercises ... applied to the art of printing, section 22, number 15, from 1683. That's at least three hundred years before I first encountered "Smith where Jones had had had had had had had had had had had the examiner's approval".