Thinking about it, and I'd say..using the simulation room, you bypass the two preshow videos and go into a small film where you are driving, and the trams; by the process of something Harry attaches to the tram cars, causes the trams to rise up into Jean Jacket. It tries to swallow guests, but because we are within metal contraptions, we wouldn't be able to be swallowed.
Think, like the T-Rex and Maggie mouth scenes, but taken to a level where you could include smells, wind effects, and water effects. Probably would never happen, but a man can dream (hence why even I think it wouldn't make sense).