I don’t think much needs to be said about this. Go ahead, just read it aloud, then laugh, then read it aloud once more, and laugh again. That’s what I did! This was taken with my Nikon D80 and 60mm lens. To achieve the black background I positioned the bottle about 1.5 feet from the wall, then bounced the speedlight off that close wall. I picked 1/200 shutter speed to eliminate any ambient exposure (which is the flash sync speed), and due to the inverse square law, the background got virtually no flash exposure. Viola, it’s that easy. I’ve taken portraits of the kids this way before too, it’s a very useful technique.