It's great that celebrities take the time to entertain the troops, especially during the holidays.  But sometimes these famous civilians get a lesson in army life.

Today's Viral Outbreak video continues my Christmas theme.  While performing for the troops at Camp Arifjan, Kuwait, in December of 2007, comedian Robin Williams learned a lesson in army tradition.  While performing a stand up routine, at the sound of the bugle, suddenly every soldier suddenly stopped laughing, stood up and turned away from him.  He learned the meaning of the call of "Retreat" as the sun set.  He later stated he was very impressed and humbled to have been there.  Here's the video of that moment.  Careful, there's a little salty talk, not too bad, but you may want to make watch it before you show any kiddos.