An aunt of mine told me that, when she feels someone is willing to cause her damage, she imagines a glass cage around her: all the evil will hit the cage and go back to the person who sent it. Is it true?
Who knows? For some, it may not be. Others believe in the propagation of all kinds of energy and don't think it's nonsense. The only truth is that it makes her feel stronger and better. Good for her, and I myself wouldn´t mind trying, too. Trying to imagine the cage, I mean... not to send her some evil thoughts to see if they will indeed come back to me.
Such things don´t need scientific evidence… if it works for you, who cares about science?