Writers, get your pens ready! We've read stories about people who feel no pain, but a woman, known in a recent profile simply as SM, feels no fear. Literally. She's not trying to put on a “brave face,” she simply does not, biologically, “have the parts” that allow her to feel fear. SM suffers from Urbach-Wiethe syndrome, an incredibly rare condition which usually manifests in skin lessions and other skin conditions (if it manifests at all) but also has neurological ramifications—a lack of fear. While this sounds like it makes a woman into a Rambo-esque character, it has had some serious consequences. Without the biological feeling of fear, SM has found herself in some tight spots: most notably being held at knife-point with her three young children in tow. This story ends happily, as SM's lack of fear led her to confront the man in a way he wasn't expecting—“go ahead cut me, but I'll be coming back to hunt your ass” isn't the usual reaction.