I was in a serious car accident when I was a young man -- both legs broken and, more severe, a shattered L3 vertebra -- and this rings true for me. It's a diffi

I was in a serious car accident when I was a young man -- both legs broken and, more severe, a shattered L3 vertebra -- and this rings true for me. It's a difficult feeling to relate, fully, but what basically happened afterward is that this previously abstract notion of a "car accident" irrevocably crystallized into something that actually can and does happen and so riding in a car with other people for whom this possibility remains abstract is now almost unbearable.