I recently read about a roller coaster accident at Alton Towers amusement park in the UK. Apparently, one carriage on The Smiler ride crashed into a second, empty car. Several passengers on the moving car were injured, one critically. This BBC link details the full story.
I love roller coasters. Back in 1999, I received the computer game Roller Coaster Tycoon and spent countless hours designing theme parks of my dreams. There isn’t a coaster in the world that I won’t ride; I raised a few eyebrows after telling friends that I rode every coaster at Happy Valley, a Disney-esque amusement park in Beijing (wiki site here). China does not have a great reputation for quality control, but I survived the experience without even a trace of whiplash, and would rank Happy Valley as one of my favorite amusement parks anywhere. Far scarier was Rutschebanen coaster at Tivoli Gardens, in Copenhagen. On this 101-year-old wooden coaster, the operator responsible for braking is a passenger on the ride!