In Dark carnival, the last level - Concert, as soon as you walk out find a pipebomb, then when you walk through the stadium doors you will see a high pillar on the right of the stage, climb up it.

Then turn around you will see 3 open doors, turn back around and aim your back towards the second.

Then look straight down at the wood, throw the pipebomb, then hit Y button as fast as you can and you will start flying.

Don't stop until your totally in the room. This could be useful to hide from the Tank or Horde.