World 4-4 Creepy Ghost

Didn't know about this until today. If you wait in the last area with the flagpole in World 4-4, you will see a faint ghost figure appear and disappear. Tried it myself and it really is creepy. It's worse than the figures in the Shiverburn Galaxy.  :mute:

EDIT: You can see it in the video at 1:09, to the left of the timer.