While stationed near DC in the early ‘60s, I viewed the flik, On The Beach—this one kinda grabbed me..
http://gunnyg.wordpress.com/2011/04/17/on-the-beach-ending-scene/
While I think the original the better movie, the remake has one of the most chilling scenes I've ever watched in a movie.
Right before Lt. Peter Holmes is about to administer the suicide pills/shot to his young family, he goes outside and shuts off the electricity to his house. It doesn't sound like much but when you watch it you realize it such an act of finality it just crushes you with the realization that no one will be left to do such mundane tasks nor will their be anyone left to use the everyday conveniences we all tend to take for granted...