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By  Moeen Zuberi Roller-coasters are one of the scariest rides man has ever created. What crazier is that you VOLUNTARILY get on a ride that initially goes at snail’s pace (and you know it) and suddenly attains breakneck speed (and you know it), in a round of endless loops might I add (and you know it!). What seems like hours actually ends in minutes. Though these rides are safe and have been tested for safety, there have been instances where accidents have taken place. Below are some of the worst roller-coaster crashes in history. 12.  Darien Lake Theme Park, Syracuse, New York Source: syracuse.com In July 2011 US Army Sergeant James Hackemer was thrown from the Superman roller coaster and fell to his death. He was an Iraq veteran who had lost both his legs and should not have been allowed on the ride. 11. Oakwood Theme Park Pembrokeshire, Wales Source: en.wikipedia.org In April 2004, a 16-year-old girl named Hayley Williams was riding Hydro, a wat...