This past Sunday, Victoria's youngest daughter Sasha went to Disneyland with 24 close friends. (Somehow, the Blue Bayou accomodated all 25 of them!) They went on Space Mountain and halfway through the ride, it stopped. The lights came on and they sat for a bit. Then their "rocket" very slowly completed the circuit while the lights remained on. Then they were let off. The ride quickly returned to normal operation and they were allowed to jump ahead of the line and experience a "normal" ride.
Here's a photo of Space Mountain with the lights on (That's Sasha in the very front):