system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we get dizzy when we spin.
gpt
There is a little bit of "jelly" in our ears that we use for balance. They tell us if we are leaning, upside down, etc.

When you get dizzy, the "jelly" in your ears are sending mixed signals to your brain, so it is having a hard time figuring out what is up and what is down, so you feel very disoriented until they can sync up again.

This is why roller coasters are very disorientating and cause people to vomit. The rapid twists and turns make it hard for our brains to keep up with where "up" is, and this can lead the body to think you've been poisoned, thus you vomit in an attempt to expel any toxins you might have ingested.