RollerCoaster Tycoon 3 Easter Egg - Clicking Around

When you see one of the guests holding a balloon, click it to pop it, they will act surprised for a moment and then keep walking along.

Click on one of the ducks.. they will either quack, have their feathers come off or stop flying for a second.

In the second park in Carreer Mode, scroll to the top left corner of the screen until you see a little generic building, there will be a thug with a gun in it and it will be shooting in random directions.