you notice how coop drew this lettering (it's technically not 'text' or 'type') seperately and then PASTED it onto his image, trying carefully not to disturb anything important in his drawing? this is definitely a learning exercise. later, the lettering was worked in as part of the drawing itself.
he never took the next step, however, where you take the lettering and literally make it part of the imagery. he sorta stopped with placing the lettering above or below his central image like a caption on a gag panel.