how induce vertigo:
if you're on a ride, find a mirror or other reflective surface and angle it so it covers one half of your field of vision and looks backwards.
your eyes will now see that you're going backwards and forwards at the same time (you're spinning), while your inner ear will tell you that you're going in a straight line.
it's a really disturbing feeling.
for extra disorientation, face the back of the ride. it's already a little weird to sit "the wrong way" on a ride, so it'll add to the effect.
i did that the other day and my whole head felt warped afterwards.
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