From the Gaurdian.co.uk

Being stuck in a lift without power or light is an unsettling experience for most people.But throw in a little ghost girl who seemingly suddenly appears from nowhere and it becomes terrifying.
The concept is a popular prank on a Brazilian television show.


They tap into some pretty primal fears here and the prank is designed brilliantly - Notice how almost everytime the lights go out people gravitate towards the control panel and away from the trap door.