HV20 Rack Focus
 

Although it is a royal pain in the butt, it is possible to pull off a rack focus with an HV20 without a 35mm adapter. You have to zoom in all the way, change to manual focus, and then roll your finger on the focus dial. It takes practice but it can be done.

Here's a clip of me trying it at a baseball field.

http://www.youtube.com/watch?v=-sZXUcJxroY