Random Events
Throughout the game, there are several random events that can occur. This is by no means an exhaustive list yet:
Farm Events
Meteorite
There is a random chance that a meteor can fall from the sky onto The Farm at night.
The Crop Fairy
During any of the growing seasons, there is a chance for the Crop Fairy to appear once you go to bed. She will select a a certain number of tiles that contain a crop you're growing, and that number may, or may not be random. Everything from a 2x4 area to a 3x5 area has been reported. This area will then immediately be available for harvesting the next day, no matter what growth level the crops were at previously.
The Witch
In a random event after you sleep, a witch will fly over one of your Chicken Coops, leaving you with a Void Egg in the morning. This can occur on an empty, or full coop. Incubating the Void Egg will result in a Void Chicken.