Repel Flies with a Bag of Water - Lifehacker
via lifehacker.com
Houseflies, being highly edible and defenseless, are nervous types, and don't like to sit still when they see something moving nearby, because it could be a predator. The water bag acts a bit like a lens—try it some time—in which the movements of people in the area are reflected. Even if the fly is too far from the action to see it directly, it can see a shifting of light and dark in the water bag, which it interprets as nearby movement, and it will fly away from the bag.
Given that as a nation we are both accustomed to and annoyed by the pesky blowie I'm surprised that I had to read this on a US web site. Does it work?
