system
A chat on subreddit /r/NoStupidQuestions
human
A gamma ray burst originating in our Galaxy and hitting Earth could cause a mass extinction without us ever seeing it coming and no real way to protect against it.

There's a *very* low chance of it happening though, so you shouldn't worry about it, but still a chilling thought.
gpt
Damn.  Thought we’d just have a lot of hulks.