There are other good reasons for using your camera in a strange way..
using a flash above your flash shutter sync speed (ie 180 max when flash is on). If you go into manual mode and crack it upto say 250 the flash will light up some of the photo while only ambient light will do the rest.
This could be handy say, if the subject was back lit and u wanted fill flash with the lens open more.. you could rotate the camera so that say the darker part (were the shutter is covering the exposure because its to fast) is at the sky.
You will get a faster shutter speed and fill flash and no loss of light since your flash cant light up the sky anyway
