Please take a moment to consider the Beat Blender.

Matti Niinimäki found a blender at a flea market and noticed that the mixing modes corresponded to DJing terminology. He added an Arduino controlled RFID reader to the blender so he could DJ by inserting felt fruit pieces with embedded RFID chips into the blender. The buttons on the blender were also re-purposed to control the mixing modes. The Arduino relays the information regarding the fruit in the blender to a computer which then does the corresponding audio work.

The end result of this is simply stunning: DJing using nothing more than kitchen appliances.