My college had a swimming requirement for graduation. Since they required two phys ed credits per year, those who couldn't swim, including one of my best friends, got their PE credits in swimming and QED.
Apparently the rule started when a student drowned one summer (not at school). Her wealthy family donated the cost of a pool to the college with the stipulation that all students must pass a test. I passed mine Freshman week before class started, but those who couldn't learned sometime during the four years.