If you are as easily amused as I am you will get a lot of mileage out of this. I don't know if this has a name, I call it "goobing". I will post a slideshow of some of these, if anyone shows any interest. I didn't see this posted yet, it might be old news. (I have been told that I am still living in the 70's)
Step 1: How to Do It:
Take something recognizable, a photo, a playing card, a dollar and scan it, but as the scanner head travels, drag and slowly spin the piece, always keeping the piece above the light, but flat on the scanner. The resultant distorted image is a "goob". A dollar works great, I think because of its immediate recognizability, the beauty of the thing, also the unusual rainbow moire effects that are sometimes created. I don't think the secret service has a problem with this as long as you're not printing out dollar bills. Here are some examples. Boredom ends now!
Step 2: Experimentation Is Key!
Try many different things, use you fingers to twist items, I put the dollar on a piece of cardboard and tape that to a pencil to allow faster twisting and turning. You could mount that assembly in a drill if you want to spin fast.
Step 3: Or Don't Twist
I think you get the idea, but Instructables said I should put more images on, so even though the actual instructions only took one sentence, I will continue to expound. This is a no twist example, just a shifting back and forth.