It’s also a stupid program that doesn’t recognize some classes can substitute others, nor that I may want to finish my gen eds after my first two years. But it gives you a good idea about your unmet requirements for any particular major.
Spud, I know of a weirder change… engineering to Portuguese.
I don’t think it’s that uncommon for there to be drastic changes in majors. Both my brother and I switched from Science (psychology) or Engineering (computer science) to Liberal Arts (communications and political science).
If you don’t know what you want to do with your life, drastic changes in major are common. I am an extreme example. I went from Biology to Business Administration to Criminal Justice to Geography to Anthropology to Social Sciences. 
I started out as a linquistics major but I never took any courses. To change majors at my school (KU) was a matter of dropping by the school office and filling out a little card with a four digit code.
This was before online enrolling or anything (KU took a long time to advance into 90s). I imagine it’s just as easy now.
My brother did the “English Literature --> Philosophy --> Criminal Justice --> English Composition --> Philosophy --> English Composition” dance.
At KU at least, if you’re staying in the same school (Liberal Arts vs Fine Arts or Journalism or Architecture) you don’t need to change your major officially to take a few classes and see what you like.
When I started college I majored in Chemistry. The primary reason for this choice was that I found the subject interesting in high school; I had also been in the Drama Club in high school, but didn’t think of it as a career choice. In my sophomore year I tried out for several plays, and found that I was more interested in acting than chemistry. So between my sophomore and junior years I changed majors. This led to a very interesting last two years, as I had to compress four years of Theatre classes into two years (which included being involved in every production in various capacities) plus fill in a good chunk of gen ed requirements which had not been taken because it was usual for science majors to concentrate on science and math during their first two years. At one point it looked like I was going to have to put in an extra semester in order to get all the needed credits; fortunately for my finances this proved unnecessary.
And after all that, I ended up shuffling paper for the government for a living. But I wouldn’t trade those two years for anything.