At the start of every storm, Pinkie Pie forsakes the safety and comfort of her home to gallop out into the rain and the lightning, and sit on the tallest hill in Ponyville. Everyone writes her behavior off as her "just being Pinkie Pie". That's true, though. She is being Pinkie Pie. Pinkie Pie would do anything to show a friend that she cares, and she knows one friend who is closer to the storms than anyone else. She knows that by showing her love for the storms when no one else will, she's showing her love for the pony who makes those storms.