When you're shooting for a truly exaggerated point of view, twist on the Pro DV Series .3X Ultra Fisheye Adapter. The Fisheye gets you the widest view possible, with extreme barrel distortion. This non-zoom-thru add-on provides approximately 1.4mm focal length, 130 degree horizontal angle of view. Note vignetting will occur at the extreme wide angle.
Way out there:
The fisheye exaggerates depth, pulling nearby objects closer, and causing distant objects to recede into the background. A fixed adapter, the 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.