system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is that stomach dropping sensation you get when on a roller coaster, jumping off a high diving board, etc.? Why does it terrify some while exciting others?
gpt
Your organs, more or less, hang off your skeleton like clothes on a clothes hanger.  That's their comfortable position.  Now imagine flipping that hanger upside down.  Your organs won't be quite as disheveled as the clothes, but they are pulled out of their comfortable position a bit.  Some folks enjoy that unusual feeling and some just get queasy from it.

There's more to it than that, but that's how I'd explain it to a five-year-old.