Canterlot Short - The Art of Friendship - S0.E7

Struggling to pick an idea for her painting in art class, Pinkie Pie takes Sunset Shimmer's suggestion to "get the creative juices flowing". She drinks some juice in the cafeteria, dresses up as a bird to watch and annoy the ones in her neighborhood and then plays a drum solo that ends with her pounding on a bucket in the art classroom, driving everyone to distraction. When Sunset explains that she likes to paint things that make her happy, Pinkie acts on that idea and sloshes paint all over herself and the other students' projects, resulting in her quickly turning out a simple portrait of Sunset.