I was driving on a 1 lane road (2 way-traffic) that allowed passing (straight w/ dotted line). The road descended down into valley, and went up again on the other side. I was going down at the time, and decided to speed up and pass the guy in front of me. On the opposing side of the valley there was a van also in the process of descending.. I mis-judged the pass and had the oncoming van not pulled onto the shoulder, I would have been killed, and so would he.. I would have made the pass fine, except for the fact that I forgot to account for the fact that he was also going downhill, and thus travelling a lot faster than vans typically do.
That was easily my closest experience to death while driving, especially considering that I was going downhill, thus making it harder to "back off" the pass and fall back into the right lane.
Other than that, I haven't really had any near-death experiences, but I do think that if I die by a means other than natural causes, it will likely be in a car accident. Because of the things I do lately, that is the one that can be the most dangerous at certain times. That or falling off my chair and breaking my neck, but I find it pretty hard to rock on a swivel chair, so I think I'll be ok there.