When you're shooting for a truly exaggerated point of view, twist on the Century .3X Ultra Fisheye Adapter.

This Fisheye gets you the widest view possible, with extreme barrel distortion.  This non-zoom-through add-on provides approximately 1.4mm focal length and 130 degree horizontal angle-of-view.  Note that vignetting will occur at the extreme wide angle.

The fisheye exaggerates depth, pulling nearby objects closer, and causing distant objects to recede into the background. A fixed adapter, this Fisheye doesn't allow for zooming — but you'll want to stay at the wide end of the range anyway, for the most pronounced effect.

The Fisheye Adapter mounts via bayonet, in front of your lens, in place of the factory shade.