Hey Arnold Subliminal Message Laughing Grandpa

Hey Arnold Subliminal Message Laughing Grandpa is a screamer video uploaded to YouTube on October 30th, 2006 made by user likekurdtcobain.

Video
The video shows a still image of Arnold's grandfather from ''[https://en.wikipedia.org/wiki/Hey_Arnold! Hey Arnold!]'', with a sound clip of his trademark laugh. Over the course of the video, his laughter is gradually slowed, so that the viewer can identify a hidden message. however, after About 36 seconds, a face of ugly eerily grinning young man appears with an ear piercing scream.

A variation exists where a face is replaced with a picture of Regan MacNeil from The Exorcist appears with the same scream is from The Maze.

Links
NOTE : The following videos contain screamers!
 * youtube.com/watch?v=hmU2Ydip0Bo
 * youtube.com/watch?v=GqLMTDW8Eoc (Alternative Version)