Misleading title. >he was wearing a 20lb (9kg) chain with a lock that he used for weight training. That is not what any reasonable person would call a "neckla

Misleading title. >he was wearing a 20lb (9kg) chain with a lock that he used for weight training. That is not what any reasonable person would call a "necklace." Yes, metal and MRIs don't mix well, but normal jewellery won't be able to generate enough force to kill you. It might actually be more dangerous due to inducted currents heating the thing up and giving you burns.