(I have told this story previously on MousePad)
Mine wasn't a close call for me, but witnessing a car lose control and slam into the center divider at full speed (lotsa sparks - holy crud!)
The scariest part was when Susan was taking care of the injured person and I realized that this darkened car was still half-way in the far right lane (and not at all visible with no lights around). To insure Susan wasn't killed or hurt, I went a ways up the freeway waving cars over. Took a while to wind down from that experience.
You can read the whole account in my post on
MousePad.