What's the most scary, but best rollercoaster you've ever been on?
Mine would have to be one called "Superman Escape" at Warner Bros. Movie World. What happens is there is an Earthquake in the undeground Metropolis Rapid Transport System, there's police cars piled up and everything, pipes bursted, things like that, then you hear Superman say "Don't worry, I'll get you out of hear", then the rollercoaster shoots out of the underground Subway at 100km/h, it goes from 0 to 100km/h in 2 seconds, man the G-Force on that ride is like nothing I've ever experienced before, it was an awesome ride, I suggest you ride it.
Here's a picture:
Click this link for some facts:
http://www.movieworld.com.au/rides_attractions/ride_details.cfm?ride_id=18