I climbed up a mountain, and walked down the other side to find the world empty. The hedgehog men had all vanished. The velociraptors, too. I thought they must at last have gone home, numb with the final, cold realization that they were not, perhaps, setting-appropriate to the Serengeti.
Thinking this was part of some kind of scheduled event (though it completely threw me off that the music didn’t change – the music always changes when weird stuff happens in games!), I explored for five or six minutes before realizing that the items, NPCs, and other players were also all gone.
Then it shut down and told me I’d been disconnected.