- Logic and Curiosity- Nature and Nurture
Psychology majors, take note. This is how your mind actually works.
Incidentally, for anyone waiting for some sort of exposition explaining these manifestations of Susan's mind and whether or not they're real, entirely in her head or just metaphorical, I recommend not holding one's breath as I have no plans to do so. They're just sort of there. Or not. Whatever. Interpret them however you like.
The most mysterious thing about this comic is that guy in the last panel. Who IS that guy? Why is he opening a locker? What is he planning?