Lens whacking / Free lensing

This is a technique I've recently started to explore, which involves shooting with out attaching the lens to the camera. You hold the lens in front of your camera's sensor, moving it back and forth to adjust focus. It gives your footage some great looking practical light leaks, and some really strange focal planes. Below is a short tutorial showing how my crew is using the technique. Is any one else using lens whacking in their projects? Anybody have tips or tutorials showing how we can take this style even further???

Richard "RB" Botto

Pretty cool, Keith.

Pat Savage

Very cool effect!

David Timber

Not impressive.

Lionel Kahn

Thanks for putting the video together. I enjoyed seeing the end result.