I don't know if this has only been aired on British TV, so maybe a lot of you wont know what I'm talking about...
http://www.channel4.com/entertainment/tv/microsites/S/spacecadets/
But I thought it was an interesting insight into the human mind when the actor who was onboard the "shuttle" said that after a while he started to believe he was in space himself. I think this guy in effect, living a lie, was starting to loose the plot in the end. Being constantly surrounded by stimuli which are continually telling you that you are in space seemed to over power the knowledge in his brain that he knew it wasn't real. It's no wonder the people who were fooled into thinking they were in space were taken in.
We were all there once... brainwashed.