All The Stars In The Sky Can Be Mistaken For Planes
The theory behind roller coasters lies within the concept of gravity: How what goes up must ultimately come down and how friction (both literally and metaphorically) exists in the realm of our every movement. I once mentioned (to a friend) that I was on a roller coaster that only goes up. He (the friend) noted that eventually, my coaster would hit space, and my face would be torn clean from my brittle bones and my ripped skin would turn blue and my eyes would pop out of my sockets and I wouldn't even realize what was happening because I would already be dead.
A horrifying thought to my new optimism. (We both nodded in agreement.)