Half Life 2: Episode 2 Easter Egg - Lost Reference

In the chapter "Our Mutual Fiend" when you are sent to the secondary silo, you`ll come to a room where a vortigaunt in a labcoat lets you in. There is a huge barrel in the room and while facing it, you can crouch on the left side of it. You will see a stool, a table, and a computer with the numbers from LOST displayed on it.

In commentary mode, you can hear a comment there, wich tells you why they put it there. Apparently, they are all fans of LOST and they exchanged fan mail with the creator of LOST, and they promised to put an Easter Egg about LOST into a Half-Life game.