If this were a video, you'd see how pulling on the back sections of the card cause the sentiment to pop-up from inside the structure of the card. Any further message you'd like to send the recipient could be written on the back of the card.
I read a lot of dystopian and science fiction, so the zombies in the "Creepy Halloween" set really filled a void in my stamp collection. What are you waiting for? I can hear the set calling your name!