Zombie --

The Saikyo Senritsu Meikyu ("Ultimate Horror Maze") -- a 900-meter-long zombie-infested labyrinth at Japan's Fuji-Q Highland amusement park -- is billed as the world's longest and scariest house of horror.

However, at a "press conference" staged last month, organizers announced they had temporarily shut down the facility because the zombie staff had lost their edge and were not frightening people enough. While the haunted house was closed, the undead employees were put through a rigorous training program designed to upgrade their zombie skills.

Here's some video showing the treatment they had to endure:

+ Video

The horror house has since reopened and the camp-hardened zombies are reportedly as scary as ever.

[More zombie training camp videos]