The Echo Bot is a machine with a motion activated message. Record your voice on the Echo Bot, attach it where you want the message to be heard, and watch it scare the crap out of your friends and family.
How I envision using the Echo Bot:
At the front door with the message, “I shoot solicitors on sight.”
In a dorm room: “Quit stealing my sh*t.”
In the bathroom: “For the love of God, pick up your towels.”
The Echo Bot may seem like a gag gadget, but really if you think about it, it could be rather useful.