At Kennedy Space Center, the Space Shuttle simulation was pretty amazing. I believe the trick was to make us think we were sitting at rest at a 90 degree angle, when in fact it must have been less, such that when the shuttle did take off in the simulation the seat made an even higher angle (+ shaking). And the sudden lowering of the angle (when engine cuts off and we're supposed to float) was a pretty damn amazing illusion too. I definitely recommend it.