We here at Adafruit are big fans of chiptune music and this harmonica from basami sentaku is right up our alley. Via Technabob.
A few years ago we featured a harmonica crammed into a NES cartridge. YouTuber basami sentaku’s harmonica not only has a Famicom cartridge case, it produces 8-bit sound with the help of a sound chip from a NES. It also has a mode that plays the coin sound effect from Super Mario Bros. when you blow into it.