April Foals' Day. They call it a day of practical jokes and hoaxes, all for fun. Applejack disagrees, and declares her farm a "No Pranking Zone" for the day. One might think this would be the perfect Pinkie Pie repellant, and it is.

So what is a certain pink baker doing hanging out with the Apple family, when the same pony is busy pranking the rest of Ponyville? And why is Applejack going along with it?