Right when I got out of college and started working in Des Moines I had someone try to jump me on my way in to work one morning. This was in early 1993 in winter. I was walking along the sidewalk and heard someone running up behind me, I turned and looked just early enough and saw a fist coming towards me. I kind of ducked back and grabbed his arm and spun him around just sort of reacting to the attack. This put him face first into a marble building. He popped up and ran off and I saw some of his buddies laughing at him as they ran away. Left a nice blood smear on the marble, probably from his nose.
When I called the police they told me there had been a new wave of gang initiations where the goal was to find someone big and imposing and try to knock them out. I just got lucky and he got the worst of it.