I also don't know why anyone should get into the trouble of mastering this funny craft, however, I've been getting more and more messages about this lately so I decided to do a little research (no, not the town library, a few searches in google and youtube) and here's what I came up with:
Here's a guy attempting to play lap guitar without a lap guitar and without a bar or slide...
Weird guitar styles
Here's what this guy has to say about light bulbs and Xmas ornaments (!?)
"Light bulbs are easy. I've used light bulbs that are plugged in and hanging over the stage, or over the bar. The only reason I haven't done it with a Christmas ornament is because there hasn't been one handy. But it hasn't been for lack of Christmas spirit."
Old woman from Russia, the uploader says. Not very comprehensive musically but there is a certain hobo quality about her: