It depends on the roller coaster and the hardest part for me is all the people screaming.
If it was just me on the roller coaster--I think I'd ride it all day long.
Better yet, just a coaster that spins in tight vertical circles.
I find gravity changes satisfying--or i used to.
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"I'm sorry Katya, my dear, but where we come from, your what's known as a pet; a not quite human novelty. It's why we brought you.... It's nothing to be ashamed of, my dear, but here you are and here you'll sit."