LOL! There are a lot of those photos lately. I think it has to do with phones that "auto rotate" the pictures to view them, but craigslist, etc having websites that don't know to rotate them. That's what happens when I post pics from my iPhone (if I take the pic "upside down" from what the phone thinks I should have), if I don't transfer them to my computer and "Adjust" first. You'd think if it's smart enough to auto rotate it, it would be smart enough to not care which direction I held the camera in, but no.
