LOL. I've made that mistake several times when bouncing off the ceiling, and then without thinking turning the camera to portrait orientation for a few quick shots, and fire the flash into a big empty room, or down a hallway, or on one occasion, off the shirt of the person beside me, which strangely enough actually resulted in the photo having quite a cool looking coloured light coming from the side, which kind of gave the pic a funky look. It wasn't really keepable, but still looked pretty cool.