Pick up a half full bottle of water or cola or whatever, and swing it around a bit. You’ll see that the liquid inside moves a little differently to the solid bottle, there’s a bit of a lag between movement in a certain direction and it splashing down to the bottom of the bottle.
Basically, rollercoasters move you fast enough to have this effect on your blood. Different people have small differences in their bodies so they’ll each have different amounts of blood kept in their brain when this happens, and different thresholds for when the brain decides “I don’t have enough blood so I’m going to shut down until I get it”.
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