The Orange Box Easter Egg - Secret Left 4 Dead Trailer

This egg may take up a few minutes. First put in a copy of the orange box. wait in the main menu of the orange box where you see all five games and you'll see a little video for half life episode 2, portal, and team fortress 2. Now if you wait a little longer, another video will come and it is a little teaser trailer for left 4 dead. I found this really cool and hope you all enjoy :).