As a horizontally moving light source is approaching and passing over a wall, it is shown that the shadow on the ground at a nearer position to the wall may disappear at an earlier time. In fact, the light rays first illuminate a point on the ground and the neighboring shadow around this point will disappear subsequently in the shape of illuminated ellipses of increasing area. Such an extraordinary phenomenon occurs whenever u/c≳1−hW/hS, where c and u are the speeds of light and the source, and hWand hSare the heights of the wall and the source, respectively.