Its an animation. You don't do anything.
Nyan Cat gif - https://s-media-cache-ak0.pinimg.com/originals/c4/dd/5d/c4dd5d671bb86d8551e9697c2d9ece06.gif Troll gif - http://memesvault.com/wp-content/uploads/Meme-Faces-Troll-Gif-12.gif Tac Nayn http://vignette2.wikia.nocookie.net/nyancat/images/d/dd/Tacnayn.gif/revision/latest?cb=20130110063433
