Bullfrog's classic game "Theme Hospital" had really great emergent vomit cascades.
https://www.youtube.com/watch?v=Le_znuXcP2M
I played a LOT of Theme Hospital when working on The Sims 1, and aspired to make the Sims editing tools as easy to use and "clicky" as Theme Hospital was. That and some of Peter Molyneux's older games like Dungeon Keeper, with architectural editing and a lot of independent characters running around at the same time, had a lot of influence on The Sims.