Remember this ride? The barrel pins you to the wall while the floor drops! I haven't seen this in years. The previous Pinner said that this ride has been virtually eliminated from theme parks. I remember riding this at Six Flags Magic Mtn.
When Disneyland was being built Walt went to other amusement parks and noticed that after walking 8 feet people would drop their trash on the floor, so you will notice in Disneyland that trash cans are no more than 8 feet apart.