I feel you. I broke a spoke the other day on a steep (15%), winding, downhill with a car behind me. It was disconcerting. A lot of noise and a lot of wobble. It took me a few seconds to realize that it was a spoke. It was not really a time when I would have expected a spoke to break. I hadn't even hit a pothole. Just a little rough pavement. I heard a pop and a whizzing noise and my first thought was that it must be a burst tube. I got to the outside of a lefthand turn and slowed down, saw that both tires were full, was puzzled, but realized that the whizzing noise was rim rubbing on brake, or tire on fender. Then proceeded carefully down the hill. I'm glad it wasn't a blowout. It could have been a whole lot worse.