Disclaimer - No hamsters were harmed in the taking of this photograph. No duct tape was used (although it came close) and most of all no money was spent.
I threatened to do this a while back. I was given a webcam a few years back as part of a package to get us experimenting with how to use technology in the classroom. It was not an expensive webcam. It was not a great webcam but I did use it. Then I got bored of it. Close to a year ago I threatened to find a way to hook it up to a microscope to take close up macro pictures. Well I finally did it. It was really easy. It was Friday and I had a prep last class. Could you blame me?
On the Instructables site I found this how-to. It was as simple as taking out the lens and reversing it. A microscope was not necessary. All you need is an external webcam. While I had to do a little bit of work to get it to work it is completely reversible. Focus is really touchy and you need a lot of light but I would love to see what could be done with a webcam that has better than 640x480 resolution. Read the how-to and do it yourself. Voiding warranties is a huge amount of fun. Trust me.
Oh yeah - show a science teacher near you. Mine was as excited as a kid at Christmas.