dep
I know that feeling. The ones that still get to me the most are the desperate phone messages that people trapped left for loved ones. While running from the debris of the first tower collapse, I desperately tried to call my father. Thankfully, the cell phones weren't working at that point, or he would have gotten one of those "In case I don't make it..." calls.
I'm also grateful that purely due to fate, I was on the east side of the WTC -- just far enough not to be hit with burning debris, but close enough to be showered with glass. Bystanders on the other sides weren't so lucky. I don't think I'll ever get over that day.