Blendie is a blender built by Kelly Dobson that only works when you growl at it.
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.
Check out the movie to see Blendie in action. Dobson's other projects include Machine Therapy (therapy sessions with people and their machines) and ScreamBody (a portable vessel in which to put your screams). (via core77)