Class Listings Amusement

I've been going through, debating what classes to take next semester, checking to see which books people are using, etc., and this was too amusing not to share:



Apparently the computer system isn't set up for the possibility that the class has no text. Thus you can order the nonexistent text if you wish! It's also amusing that the nonexistent text is optional. Does that mean you can use a text if you wish?