Rotting Human
From Screamer Wiki
Rotting Human is a 32-second video uploaded to YouTube on November 2nd, 2007 by user Johnny Shocker.
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... and suddenly lunges at us as a scream is heard. The screen flashes in white and cuts to black.
Link
youtube.com/watch?v=DjzAqWkvkGU