Wow I'm glad to see that I got a good discussion going over this.
As far as it being in focus, I did that originally. I had taken couple shots with f/18 I believe, however, I preferred this one over those. Mostly, because this one turned out the best. It is hard to be consistent with a flashlight, as you can imagine.
You put a question mark after maglite with a shower curtain. Its quite simple. I set my camera on a 30 sec. exposure and turned off all the lights in my room. Then took a small piece of shower curtain, like a frosted textured one, and covered the flashlight with it. You have control over the light and the shadows in a sense. The longer you hold the light in one spot, the brighter it will be. You can get extremely creative with this. I have a bunch of things I did just as an experiment.
Its getting late now, but maybe tmrw I will post one in full focus.
Thanks again for the compliments.