This is kind of based on a scene from Father Ted. Now, while =Veggie55 was probably a toddler when I first watched this program, Father Ted and ponies is sorta his thing. So his stuff probably put the idea in my head.
I like the broken perspective in the last panel. Pinkie Pie's feet are placed slightly higher than Twilight's to indicate that she's further away, yet her head is above Twilight's which seems very off for the same reason. It's like Pinkie Pie is beyond perspective and can break it at will.