When you watch the opening “number” in Halloween town, there is a point when Oogie boogie’s shadow is on the moon, (the words are “I am the shadow on the moon at night filling your dreams to the brim with freight”) Directly after this the shadow turns into bats that fly towards the camera, if you look at the top of the “bat Mass’, at the top of the screen, you can see the string holding the bats up. It is really easy to see but if you aren’t looking in the right place it may take you one or two times to see them.