When you complete a scenario. Every guest in your park will turn towards the general direction of the camera and applaud. If you have a Balloon Stand, every guest who bought a balloon will simultaneously release them into the air.
It gets better if you make a point of making a ton of different Balloon Stands, each of them selling a different color.
With the ability to customize peeps it was only time before someone made a peep made to look like Chris Sawyer.
The release of RCT1 and RCT2 on the iOS and Android devices under the name of RollerCoaster Tycoon Classic.... and so far it's getting pretty good reviews.