Yes, it's Rainbow Dash's wing.That probably doesn't qualify as a prank, but man, this was never boring to do when I was a kid.Yeah, yeah, I know Dashie and Fluttershy most likely didn't know Twi' before the Nightmare Moon event.And don't worry, I didn't abandon Zecora's Story.Background by I got inspired by this: [link] I don't know if the author has dA, but if he does, could someone link it and I'll update description!