Okay, this is kind of odd… this is a blender you scream at to make it work. :) (link to blueprint)

People induce the blender to spin by sounding the sounds of its motor in action. A person may growl low pitch blender-like sounds to get it to spin slow (Blendie pitch and power matches the person) and the person can growl blender-style at higher pitches to speed up Blendie. The experience for the participant is to speak the language of the machine and thus to more deeply understand and connect with the machine. The action may also bring about personal revelations in the participant. The participant empathizes with Blendie and in this new approach to a domestic appliance, a conscious and personally meaningful relationship is facilitated.


http://web.media.mit.edu/~monster/blendie/