Reminds me of that Derren Brown sketch where he asks a guy to trial out a new zombie 'shoot em up' arcade game. He hypnotises him and leads him into a full scale mock up of the game with real (ish!) zombies and then 'wakes' him up - haha the guy is frickkin terrified for about 5 minutes - really terrorised!! Then he hypnotises him again and returns him to the arcade game and wakes him up. The guy is gobsmacked at how real the game is!