I am one of those people that have extra electricity in my body - I know it sounds crazy, but it is true. And If I am upset my body has a tendency to cause other items that draw electricity to short circuit, I can't even use a phone. So I would be afraid to use my machines, even if I was trying to calm myself. I don't think fabric will hold on to the negative, but when I make my quilts I do it to feel good. Sometimes they don't come out the way I hope but my intentions are there.