My experience was partially due to a traffic light stuck green my way. I had just pulled out of a gas station on my 71 Suzuki Titan twin, going 45mph and the only thing I remember is seeing a flash of white. The 17 year old female driver had decided it was safe to cross, and didn't see me, even though I had my headlight on. I flipped over the car, and landed on my back. I passed out for a couple of minutes, but since I was wearing a full face helmet I survived unscathed.
Recently, I was heading towards a right turn, and some jerk pulled out of a driveway in front of me close to the corner while clearly smirking at me. I got good use of my double-disc front brake, and avoided hitting the jerk.
As said before, assume that no-one see's you, and be very cautious at corners and intersections.