Mary Norris in The New Yorker:
I didn’t set out to be a comma queen. The first job I ever had, the summer I was fifteen, was checking feet at a public pool in Cleveland. I was a “key girl”—“Key personnel” was the job title on my pay stub. I never knew what that was supposed to mean. I was not in charge of any keys, and my position was by no means crucial to the operation of the pool, although I did clean the bathrooms. Swimmers had to follow an elaborate ritual before getting into the pool: tuck your hair into a hideous bathing cap (if you were a girl), shower, wade through a footbath spiked with disinfectant that tinted your feet orange, and stand in line to have your toes checked. This took place at a special wooden bench, like those things that shoe salesmen use, except that instead of a miniature sliding board and a size stick for the customer’s foot it had a stick with a foot-shaped platform on top. The prospective swimmer put one foot at a time on the platform and, leaning forward, used his fingers to spread out his toes so that the foot checker could make sure he didn’t have athlete’s foot. Only then could he pass into the pool. I have never heard of foot checkers in any city besides Cleveland.