system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When going over a hill in a car, what causes that fluttery feeling in your stomach?

My daughter asked me this question while we were driving earlier today and I was completely stumped.
gpt
That's your stomach jumping up in your abdomen. You might be (hopefully) strapped in with a seatbelt, but your organs as such aren't. They can move a little bit when you're in a car going over a hill, and that's all it is.