Wile E Coyote, Genius.
I never tried it, but this guy swears by it.
It has been throughly disproven in several locations on several occasions.It's been going around for years. It's never been proven, but it hasn't been disproved either. The thought behind it is that the light refraction is what does it. If that's true, hanging wrinkled up aluminum foil would work too and probably better since you would have more movement... unless it's the fact that the light bends, then you could hang prisms (would be prettier too).
The store I went to had them inside, outside, in the shade and in the sun. There was hardly a spot that did not have one. I think that all bases were covered and still, "NO Cigar". They were obviously not doing a durn thing.He did say that the bag had to hang in direct sunlight. So inside a building would not be a fair test.
It wouldn't work on me. If I were a fly I would be like all other flies and be seeking out the nastiest smelling crap I could find (or, a paper plate full of picnic food) and, pennies in a bag of water be damned, full speed ahead!Well, I can imagine that I am a fly. With compound eyes having hundreds of faceted images being projected onto my fly retina. Then having a dazzling array of flashing strobing lights of different colors and intensities flashing into my compound eyes.
I would fly away until my senses were no longer overwhelmed.
it would work on me. I can't believe a fly is better then me. I am at least the equal of a fly!