Personalised Grease 'Birthday Rules' Birthday card Gift your Grease fan this Official Grease Birthday card that can be personalised just for them! This card features Kenickie Murdoch, one of the T-Birds, as well as the famous car from the movie. "The birthday Rules Are There Ain't No Rules!" reads on the front of this card in white and gold metallic text. The background of this card is filled with stars, the T-Birds symbol as well as a lightning bolt, of course! There is also plenty of space on the inside of this Grease Birthday card for you to send your birthday wishes.