This reminds me of a practical joke(revenge) my friend did to his co-worker who as an a**hole. Their company bought a D7000 to be shared between him and this person. He said, "Being an A**hole, the co-worker would not accept any instruction and openly boasts that he is an expert photographer". What he did was turn-off the anti vibration & auto focus in the lens, the auto focus switch in the camera, and then adjusted the camera so that it uses the back button to focus, instead of the half press and finally adjusted the eyepiece diopter. Needless to say, his co-worker was never able to make any useful picture with that camera as everything would always be out of focus.