Consoling Couple

In the first chapter of Half-Life 2, Point Insertion, a man sitting on a couch can be seen embracing a woman while she weeps over their grim situation. They have appeared at least once in every game so far since their first appearance and are considered more as an Easter Egg than actual characters.

Half-Life 2
The player passes by them while going through the apartments in Point Insertion, just before the Civil Protection raid. They later appear in a different apartment in Anticitizen One, near the drawbridges, in Resistance attire.

Episode One
They can be seen, again in Resistance attire, in the building where Barney is met.

Episode Two

 * Two skeletons can be found slumped in a similar pose on a couch in the White Forest.
 * When first going to visit Uriah (before visiting Eli and the Hunter attack), the couple can be seen through a window, weeping once more.

List of appearances

 * Half-Life 2
 * Half-Life 2: Episode One
 * Half-Life 2: Episode Two