Though I do not remember the year, Clampitt was invited to play as a marker after missing the cut. This occurred very early in his career. For some reason I'm under the impression that his group started on the tenth hole- perhaps there was a weather problem that necessitated a two-tee start.
Anyway, he played from tee shots from his knees for one or two holes before being relieved of his assignment. It was felt (correctly, IMO) that his actions were contrary to the nature of the competition. I do not know how his fellow competitor(s) felt.