It’s one of those days you remember better than any birthday or wedding. Those were planned; these hit you suddenly, stunning your mind, breaking your heart. “The shuttle blew up!” “The Towers fell!”
The impact was even greater if you saw it happen in real-time. If you watched the shuttle launches. If you caught the breaking news before the second tower was hit. Saw the second plane, realized at that moment, “This is no accident!”
Even if you saw it after, you saw it; saw it as an attack.