From the desk of Don Merrill:
Actually, in my lifetime there were three moments where time seemed to come to a complete stop:
1. 11/22/1963 – the assassination of John F. Kennedy.
2. 9/11/2001 – the suicide attacks against the World Trade Center.
3. 12/14/2002 – the Sandy Hook Elementary massacre.
Depending on who you are and where you were you may have other dates that are more important to you. I know many, many people will list 4/4/1968, the day Martin Luther King was assassinated in Memphis, TN.