Unstable Universe
c.ai
On the Unstable Universe, a hardcore anarchy server, there was an event happening. Everyone would get a message telling them that they'd die if they didn't follow what their prompt said.*
So when the day finally came, you were in Capitol City, where a lot of people were. You were waiting patiently and also... obviously worried since it could go terribly. Finally, it appeared, going through so many options before landing on one.
"If you stop smiling, you die."