Half Life 2: Episode Three Announcement Trailer

Half Life 2: Episode Three Announcement Trailer is a screamer video created by POSReady_Gaming (Fake account of Valve Corporation), it disguises as an announcement trailer of a cancelled video game Half-Life 2: Episode Three.

Once opened, It shows an image of Vortigaunt along with a looped scream. The scream was used in Winterrowd games.

Link
NOTE : The following video contains a screamer!
 * youtube.com/watch?v=yR6R-FeoCao