Let me guess ... you took the picture with an iphone, with the volume keys up?
That would be a natural way to hold the phone, since they advertise using the volume keys to take the picture as a feature of the camera app, but when you send these pictures to people, they are upside down. And when you email portrait pictures, they are always sideways. Geez, you'd think these "geniuses" could figure out how to solve this glitch by now.