Chad's Idea
Sorry to butt in but I saw the movie, and came up with my own ideas for.
It wouldn't be so much a roller coaster, as it would be a fast moving dark ride...
The outside of the building would be the outside of Monsters, Inc, when you enter, you'd get to the loading area, the cars would look similar to the JIYI cars, but they'd enter from the back, and infront of the cars would be a movie screen, shwoing (while you're loading) the Scare (or now laugh) zone. It would be worked out to make it look as real as possible, for example, a real pipe going over your head would continue in the movie, and stuff like that. After everyone is loaded, sully and mike would come onto the screen.
"Welcome everyone to the Tour!" sully would say, holding a clipboard,"Here at Monsters Inc, we power the city with the laugter of children, and we're gonna share some of our techniques with you on this exclusive tour! First, we'll show you our patented door retrieval and sorting system..all of which is controlled by this control panel, whick mike is now holding.."
Mike would hold the controller up,"See, with this ingenius device, designed by yours truly..."
"Mike.." sully would say, all long and drawn out..
"Quiet big guy! You're ruining my moment...Anyways, with this, I can summon the door to any house all over the world, and send it back with our custom retrieval arms...Ahem..let me demonstrate.."
Mike would punch a few buttons, and when nothing happens, he starts getting mad, and begins pounding on it..
"Stupid thing!" suddenly, the humming of a motor can be heard..
"Uh-oh.." the big eyed critter would say, as an actual arm lower from the ceiling above your vehicles and picks the tour cars up, and suddenly turns them..
"Whoops.." he would say, as suddenly, the tour cars are whisked away into the door sorting room, you would dart around at top speeds of around 20 mph, wheels projecting the cars as you zoom by doors...Your car would turn,a nd it would seem like you are going to crash into a door, when it would open, and you'd end up in some child's bedroom in tahiti, only to reenter another closet door, end back up in the sorting room, and go into another door, and end up in Germany..You'd go through a series of 5 or 6 different rooms, zooming over children screaming as a tour car suddenly bombards their calm house. Near the end, you'd zoom through a monster laugh zone, and see monsters dodging and jumping out of the way, you'd go down a narrow corridor, and an AA of mike would be at the end, with the controller, cornered in the hallway with a tour car flying towards him, he would frantically be pushing buttons, trying to stop the arm, and right before you hit him, Ta da! It stops
and lowers you back to the ground so you can exit.
Sully would join the scared mike and say,"Um..that compeltes the tour! Thankyou for visiting us here at Monsters Inc!"
This ride is fast enough for the average teenager, and yet, lacks the jerks, darkness and loud noises that would make it to scary for expectant mothers, small children, and grannies.