If you swallow two (or one and it breaks in half), there's a risk that they'll clamp together inside you, with your intestines in between. Having played with n

If you swallow two (or one and it breaks in half), there's a risk that they'll clamp together inside you, with your intestines in between. Having played with neodymium magnets, having this happen to your finger or ear isn't pleasant, but the real risk is that they'll clamp together and tear a hole through your guts.