FILE - This April 19, 1995 file photo shows rescue workers standing in front of the Alfred P. Murrah Federal Building following an explosion in downtown Oklahoma City. Sony Electronics and the Nielsen television research company collaborated on a survey ranking TV's most memorable moments. Other TV events include, the Sept. 11 attacks in 2001, Hurricane Katrina in 2005, the O.J. Simpson murder trial verdict in 1995 and the death of Osama bin Laden in 2011. (AP Photo/David Longstreath, File)