Fly on Desktop Screensaver 

Fly on Desktop Screensaver is a program that will display flies crawling on your monitor.

When your computer becomes idle, and your screensaver becomes launched, a number of flies will start walking on your screen, stopping and rubbing its hands. As with any screen saver, you can set some parameters using Windows´ Screen Saver Settings, like how much idle time will the program wait before launching itself, and if it will display the logon screen when returning. This window also allows you to access the internal settings of the program, like the number of flies that it will show (from 1 to 99) and if the screen saver will appear on top of every other window on the screen. The ideal number of flies will be between 5 and 10. More than 20 could hang the program, that will launch, but will not stop once you move the mouse or press a key on the keyboard. In this window you will also have the "Preview" button, that will show you the screen saver in action until you touch something. When running (not in the preview mode) you can eliminate flies just by double clicking on them.