According to Digital Spy:

Illusionist Derren Brown has revealed his latest stunt to be shown on TV - making a woman believe that she has died in a car accident.

Julie Simm was hypnotised by Brown before being taken to a mock crash scene. She was then allowed to wander around the wreckage whilst ambulance men removed what appeared to be her body from a car.

The stunt is part of Derren Brown's new series Trick or Treat, in which participants have to choose a card to determine if they will receive a treat or be tricked by the illusionist.

A source at Channel 4 told The Sun, "She can't believe what's happening. As far as she's aware she is still alive, so she ends up having this strange out-of-body experience. She's clearly distressed, but not hysterically so."

They added, "She vowed to wear her seat belt from now on so it's had some public service value."