Ghost in the London Dungeon

Ghost in the London Dungeon is a commercial from the UK for the attraction of the same name (The London Dungeon).

The video has been thoroughly analyzed by experts but they have so far offered no explanation as to what it is." In the next scene, there are two fuzzy separate security camera images with the words "MAIN EXT JACK ENT" on the left and "PRIS DR" on the right. The timestamp "05:59:50" and the date "20-11-04" are displayed at the bottom. The image goes fuzzy for a moment and the time advances to "10:09:43". You can also see, what appears to be, a janitor holding a broom walking out of range of the camera on the left.

After 34 seconds, a man with long white hair, black teeth, and wearing rags, jumps up, his face filling the screen, and yells: "DIAAAAAAAAARG!". He stays like that for a while, staring at the camera with his mouth wide open. After a brief pause, he seems to faint and descends into oblivion. The following text then reads: "Did you spot it?" which the logo is shown.

The earliest copy of this was uploaded on January 6, 2006, to YouTube by a user Log Bog, the creator behind Stickman Screamer.

Links
NOTE : The following video contains a screamer!
 * youtube.com/watch?v=2h3hVrootIg