Dawn of War Screamer!
Dawn of War Screamer! is a screamer video by VenerableDread in 2006.
The video starts with a transcript saying "What is wrong with this Dawn of War screenshot? Look carefully" image from the video game Dawn of War. and (obviously the picture: one's zoomed in a bit) however, after 15 seconds, an inverted boy's face pops up with a loud roar, a text will appear as displayed "So that's what's wrong with the screenshot? Wierd." and another text fades "Actually, VenerableDread strikes again! MEH!" end of the video.
NOTE: The following video contains a screamer!