A big pyro explosion with shadows. Shadow and the explosion are two different .mov files so you have room for editing. Check out the preview video to see the effect with and without shadows. Also the effect is always kept in frame (it doesn't leave the camera view) so you can scale or transform it anywhere you want to without worrying about clipping issues.
24 fps - Alpha Channel - 1920x1080
HD
1920 x 1080