Half Life 2: Episode Three Announcement Trailer

Half Life 2: Episode Three Announcement Trailer is a screamer video created by Valve (A fake account made by CloudTheHandsome) It pretends to be an announcement trailer for a cancelled video game Half-Life 2: Episode Three.

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

Trivia

 * The Vortigaunt face was used in this Reddit post.

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