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)

The video itself pretends to be an announcement trailer for the cancelled video game Half-Life 2: Episode Three, Once opened, an image of Vortiquant (Happ Vort) appears, accoumpanied by a repeated, loud scream that was used in Winterrowd games, The Vortigaunt face was used in this Reddit post.

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