I've been thinking, and thanks to a little help from the off-set color of this computer I'm borrowing, what would it be like if we had weather effects in the game? Rain, which would make it impossible to water plants since they're already soaked, and may make some parts muddy. Wind, which would make it harder to walk in one direction but easier to run in another. Hail, which would lower our mood if it pegged us. Snow, which would cover most trees but also allow for creation and collection of snowballs and snowball fights. Etc.