When Pinkie becomes sad her mane and tail start to ...deflate.Yes. Deflate.Her mane and tail become flat.Apparently her mane and tail itself is a balloon.The sadder she gets, the more color she loses and instead bringing happiness she brings pure sadness, even plants around her start to wither.The worse it gets, the more lifeless she becomes.I simply wanted to draw her in this state lineless.''Ponk'' is just another nickname the fanbase gave her.