I had one when I was younger. I was walking in the courtyard of the apartment complext where we lived. It was all dusty and there were papers flying everywhere. Everything was gray.
Years later, it looked exactly like NY on 9/11. Not that I think it was a "premonition"....I think it's more a testament to how NY looked like my dream of the end of the world on 9/11. When I saw video of the smoke and papers everywhere, it immediately brought me back to that dream.