Jeu des 7 erreurs
From Screamer Wiki
Jeu Des 7 Erreurs is a French screamer first posted to YouTube by user 1stelistpanalamorate.
Video
The video is similar to Zoeken, in which you must find differences in two images. In this case, two images of trees (obviously the same picture; one's zoomed in a bit) are used. After a while, a zombie head with blood pouring out its agape mouth appears with a scream.
Link
NOTE: This video contains a screamer.
youtube.com/watch?v=8NIrotCl7WE