Friends insisted that my camera sensor was dirty and that it could be seen mainly in blue skies. So, I decided to clean it by putting the camera in the washing machine. The camera didn't like the idea, maybe because I selected a cold water program, and as a revenge took this horrible photo of me when I crouched down to peer inside to see how things were going. ;-)
(The photo was really taken from inside the washing machine and with the door closed. The water effect was added in PP).