I hadn't declared a major.
That isn't entirely true. I had declared a major (music) when I initially enrolled. But I hadn't actively pursued that major for some time and had actually managed to avoid classes within that discipline for a few semesters. This had the academic advisor types somewhat troubled, and my advisor told me - without even cracking a smile - that I would need to declare a major immediately or else I would be persona non grata on campus. She kindly showed me a list of options that she'd pulled together - potential majors for which I'd already satisfied a large percentage of the requirements. By picking one of these, she said, I could remain in good standing, take the final courses necessary to complete my degree, and graduate.
According to her analysis, I had two clear options available: Philosophy and Linguistics.
I looked at the course catalog. One of these options gave me the chance to take classes like Metaphysics and Epistemology. The other did not. It was an easy choice.
But in hindsight, I think I also would have enjoyed studying linguistics. I have always found language (and really all types of communication) to be a fascinating topic. In fact, just recently I spent an enjoyable afternoon discussing with a friend a SETI analysis of the frequency of certain dolphin vocalizations (with the implications that there is intentional content - i.e., meaning - being conveyed among the animals making the sounds).