To clarify: SimAntics, the behavior tree visual programming language actually existed before Will wrote the "Soul of the Sims".
SimAntics was used in SimCopter for controlling the little Sims with simpler souls who walked around the city, for dispatching the police, firemen and medics who picked up injured Sims and brought them back to the helicopter, as well for implementing the notorious gay easter-egg with a bug that caused hundreds of shirtless "himbos" in fluorescent fog-piercing speedos (using the same special render as runway lights) to swarm all over the city hugging and kissing on Friday the 13th!
SimAntics was used in SimCopter for controlling the little Sims with simpler souls who walked around the city, for dispatching the police, firemen and medics who picked up injured Sims and brought them back to the helicopter, as well for implementing the notorious gay easter-egg with a bug that caused hundreds of shirtless "himbos" in fluorescent fog-piercing speedos (using the same special render as runway lights) to swarm all over the city hugging and kissing on Friday the 13th!
https://en.wikipedia.org/wiki/SimCopter
https://www.youtube.com/watch?v=x4mh7Pc5MSI
https://www.youtube.com/watch?v=ozL3LtSsYd8