Rotting Human

Rotting Human is a 32-second video uploaded to YouTube on November 2nd, 2007 by user Johnny Shocker.

Video
It shows an unconscious man wearing a red shirt, lying in a blanket of the same color. Eventually, the picture fades to the same person wearing a mask, in a cheap attempt to make it look like he's decomposing. The "rotting human" slowly turns his head towards the camera, as the slowed-down heartbeat heard throughout the video changes into unnerving music... and suddenly lunges at us as a scream is heard. The screen flashes white and cuts to black.

Link
Warning: The following video contains a screamer.

youtube.com/watch?v=DjzAqWkvkGU