The radio is plugged into a socket across from the bath/shower. Mary "accidently" unplugs the radio instead of the dryer and then plugs it back in. The radio is set inside the bathtub near the father's feet, with the cord still outside the tub area. Next the cord is seen being pulled tight by someone (unseen) which pulls the radio into the bath water. From this angle, pulling the radio by its cord would cause it to fall onto the bathroom floor, not in the tub.