You must remember this.

Ilsa:  I wasn't sure you were the same.  The last time we met...
Rick:  Was the Belle Aurore.
Ilsa:  How nice.  You remembered.  But that was the day the Germans marched into Paris.
Rick: Not an easy day to forget.
Ilsa:  No.
Rick:  I remember every detail.  The Germans wore gray, you wore blue.

On this day in 1940, France fell to the Germans.  Try to mourn it glamorously.