You can mount the button on the floor, then you can step on it with your foot to initiate a voice transaction. That way, you can mystify your passengers into thinking that the empeg will RESPOND TO YOUR VOICE ONLY. Or you can mess with their minds, like, if you pointed your finger at one particular passenger, it will then respond to her voice, but only when you point your finger (and step on the switch in secret). Fun for hours and hours.

Calvin ("yes, i am cruel")