Abstract: Some embodiments provide a greeting card or a postcard with a practical joke feature. The practical joke feature can include a sound that is repeatedly played for several hours, days, weeks, etc. The card can include a mode of operation configured to allow a purchaser to experience the sound without arming the practical joke feature. The card can include a pouch that contains one or more surprises for card recipients that attempt to open or destroy the card. The card can include one or more features that resist destruction of the card and/or internal components of the card that implement the practical joke feature.

Abstract: Some embodiments provide a greeting card or a postcard with a practical joke feature. The practical joke feature can include a sound that is repeatedly played for several hours, days, weeks, etc. The card can include a mode of operation configured to allow a purchaser to experience the sound without arming the practical joke feature. The card can include a pouch that contains one or more surprises for card recipients that attempt to open or destroy the card. The card can include one or more features that resist destruction of the card and/or internal components of the card that implement the practical joke feature.

Abstract: Some embodiments provide a greeting card or a postcard with a concealed feature, such as, for example, a practical joke feature. The concealed feature can include concealed hardware that repeatedly plays a sound for several hours, days, or weeks. The concealed feature can include a concealed keeper element or pouch that contains a payload, such as, for example, confetti, glitter, stickers, or toys. The card can include a mode of operation configured to allow a card-giver to inspect and/or write on the interior of the card without activating a concealed feature. The card can be configured to release the contents of the keeper element or pouch when a recipient attempts to open or destroy the card. The card can include one or more features that resist destruction of the card and/or internal components of the card that implement a concealed feature or a practical joke feature.