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I am not sure what it has to do with horror movies, unless you saw it in one. But, with or without the pennies, if a bag of water is suspended from the ceiling in a corner or corners of the room it keeps flies away.
There has been no scientific study to prove if zip lock bags filled with water and penny's will keep flies away. There are some people who swear it works and others who swear it doesn't work.
No, that sounds like superstition. To keep flies away use gauze in front of your windows, or close the windows, and don't keep fruit around for too long outside the fridge. Flies do not react to pennies in any way, especially not in ziplock bags :P
This theory has not been definitively proven. It works occasionally, but has no scientific basis as to why it works.
The science is simple since a bag of water doesn't repel flies.
Water is very good at soaking up heat. When the water-filled balloon is heated the water Draws the heat away from the rubber. For the air filled balloon, not so much. The rubber heats up, weakens, and breaks.
Water is a very good solvent, which dissolves lots of things, and even things that it does not dissovle can often be physically washed away, with water.
yes a bag of water does keep files away as along as it is a clear bag.
Surface tension, place a drop of detergent on the water and it breaks the meniscus allowing the water to flow away. Also the cohesion makes the water molecules stay together. It is not because of the ridge.
You find pennies everywhere because people do not like to keep them and they just throw them away.
lots
Supposidly, a bag of water with a penny in it keeps flys away. However, you really don't need the penny and a half filled bag of water will catch some flys.