I REGULARLY receive photos from cameras of someones computer screen when asked to supply a "screen shot". It was kinda funny the first few times...now its just sad.
One time, my kernel was crapping out and endlessly printing stuff I couldn't read because it was scrolling WAY to fast and ctrl+s did not work either, so I photographed my screen to be able to read what the kernel was trying to tell me (hardware defect).
Once, we had an issue with a single board computer that seemed like a hardware issue so we called support, and they wanted the output of a logical analyzer. Unfortunately, we didn't have an interface for our old analyzer, and so we set up a webcam to show the analyzer screen to the support guy over NetMeeting. It was kind of funny, but worked great.
The best one I saw, though not really a screenshot, was a photo on Craigslist... someone had used his cell phone to take a photo of a car he was selling, then used a web cam to take a photo of the cell phone screen, and then uploaded that.
