There is this particular theme park I always visited with my family on vacay, easily the scariest ride is the one that is a dropper, 390ft (119m) tall, max speed of 84mph (135kph). You can see the entire amusement park as if you were looking at a miniature model. Even buses become ants at that height. And the worst part - easily - the ride hangs in the air for a whole 40 seconds. It lets you take a breather, enjoy the view, before you feel it rise up just a lil bit, then CA-CHUNK, and you plummet.
Then you line up again.