Ponies and military aircraft. Well okay, a few more things than that but that's definitely the top two. Friendship Is Magic, custom painted ponies, listening to epic Ponystep/remixes, Harry Potter, Lord of the Rings, Assassin's Creed, singing along to The Flim Flam Brothers Song, reading, movie theaters (most preferably at midnight), and trusting in God. Derpy is beautiful and speacial, and there is nothing wrong with the way she was created. No "fixed" eye or changed voice made that pony better, because she was already perfect. You can make it if you try with a hop, skip and jump.
