First thing I rode on my first ever trip to CP was Millenium Force. Therefore, nothing really scared me (other than Mantis, euw). So, I was sitting on Magnum going up the first lift hill, and was sitting up like I was eating dinner. Sat in a normal position (not resting back or anything), and when we got to the bottom of the first hill, my god did my neck ever snap. I heard it crack about 6 times. That was the most pain I got out of any of the rides at the park. Though, I must admit, it was probably my fault for not resting my head back.
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WHOO!