Hey Arnold Subliminal Message Laughing Grandpa

Hey Arnold Subliminal Message Laughing Grandpa is a screamer video by user likekurdtcobain.

The video shows a still image of Arnold's grandfather from 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 36 seconds, a face of a young man with down syndrome appears with an ear-piercing scream.

A variation exists where the face is replaced with a picture of Regan MacNeil with her usual scream.

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