My bike's steering wheel broke last week, while I was commuting to my work. Luckily enough it didn't cause a crash. I managed to stop without too much trouble. I guess my Guardian Angel was riding with me.
What caused the steering wheel to brake is still some kind of mystery. I never have had this experience before, nor fellow bikers around me. I now fitted a real MTB-steering wheel on my trekking bike, just to be sure this doesn't happen again.