Do you have an old Singer sewing machine? If so, it may be worth $50,000. BBC reported on a sewing machine hoax in Saudia Arabia in which people rushed to buy old Singer sewing machines based on the belief that they might contain red mercury. No one knows for sure where the rumor started, much less the more curious rumor that you can hold your mobile phone up to a sewing machine to somehow detect the presence of red mercury. The story goes you will lose your signal if you hold your phone up to the needle of a sewing machine that contains red mercury