This prank will dissconect the power source from the Ipad and stop the Ipad from charging. All you will need is the Ipad, scissors, the cable that goes with the Ipad and some clear tape.
Cut the tape very small, just enough to wrap around the little metal part on the connecting cord. Then, wrap the tape around the metal part and plug it into the Ipad. If the cord does not fit, then cut off some excess tape on the cord. The tape should block the connection so that the Ipad does not charge.