Ever been on one? They sit you down in these big chairs with a bunch of other people and there is this huge screen of the view of someone in a roller coaster... The seats move and fans blow wind in you're face and god it feels real! I went in the Excalibur one in Las Vegas... This was when we bought tickets to the Merlin Simulator but my dad went in the wrong room and I was petrified of roller coasters at that time :o

Sounds like Virtual Space Mountain at Disney Quest.