It's a familiar scene at every amusement park: People standing patiently in line, sometimes for more than an hour, filled with an odd mixture of trepidation and excitement, inching closer to the moment of truth. Then, after being strapped into their seats and subjected to a fist-clenching, head-spinning, stomach-churning ride, they step off, some exhilarated, others visibly shaken, only to get back in line and do it all over again.
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