I got this in an email. Checked snopes, but no results. Did a web search and found plenty that supports it works. With summer approaching I thought it would be good to share. If anyone tries it let us know.
We went with friends to Sweety Pies on Sunday for breakfast and sat in the patio section beside the house. We happened to notice zip lock baggies pinned to a post and a wall. The bags were half filled with water, each contained 4 pennies, and they were zipped shut. Naturally we were curious! Ms. Sweety told us that these baggies kept the flies away! So naturally we were even more curious! We actually watched some flies come in the open window, stand around on the window sill, and then fly out again. And there were no flies in the eating area!