Underwater Basket Weaving: the real story

We've all heard "Underwater Basket Weaving" used as a synonym for easy, impractical college courses. Turns out that underwater basket weaving is challenging, rewarding, and offered by at least two American universities: UCSD, and Saint Joseph's College Indiana. So whence the joke about UBW?
The earliest reference to the term that I could find, searching on Newspaper Archive, was May 9, 1960. The author of a Pasadena Independent trivia column noted that "Son Herbert reports that underwater basket weaving is all the rage among college students who want to spare the brain cells." So evidently the joke had been well established by 1960. I would guess the origin of the term dates to the late 1950s. Did the joke start after a college actually began offering this course? I don't know, but it seems possible.
Underwater Basket Weaving (via Making Light)

(Image: Soaking_reeds_for_basket_weaving.gif, Wikimedia Commons/Charlotte Coats)