It is a very sad thing when an event happens that sears itself into not only your memory, but the memory of a nation.
Countries and their citizens suffer through events like that. Our country has, perhaps because of its relative youth, a few of those events. In modern times: Pearl Harbor. JFK's assassination. September 11.
We tend to know exactly what we were doing when tragedy strikes.
I was unloading the van after a trip to the grocery store. A simple mundane activity that I've done thousands of times, but that one time I'll never forget.