Well, I guess my ears are just shaped weird, or something. They are at least two different sizes, I can tell that much. I went to the drugstore at lunch and bought the Philips SHS3201 earhook earphones for $10, and the right one sits pretty comfortably on my ear but the left one feels like it is a little too low. Neither of them falls out even when I shake my head hard, but I am still wondering if I should have just gotten the lightweight folding $7 over-the-head headphones instead. I got the earhook kind because I wanted something low-profile, but apparently my ears are just more bizarre than the rest of humanity’s, and perfect headphones simply don’t exist for me.