Silent Message
From Screamer Wiki
"Silent Message" is a YouTube originated prank first uploaded in October 2006. The uploader is VenerableDread.
Video
The video starts off with a message to listen closely to the audio featured in the video (to an extent, crank up the volume). The message itself will instruct you to close your eyes, and when it tells you to open them, at the exact point, an edited image of a man pops up with the same scream as the K-fee commercials. It ends telling you that VenerableDread has pranked you again.
Link
https://www.youtube.com/watch?v=3tsWpYDJsMw&index=10&list=PLs1BtYXZ8_8PwcLehwDMGGGRTOJp4HuCQ