We’ve previously featured Ivan Owen of MechMadnessDesigns for his crazy cereal-eating machine. This time he had a little fun at the expense of the local pizza delivery guy.
Owen and his daughter built air-powered musical stairs with pressure plates and antique organ pipes. They look just like normal stairs, but when you step on them it’s a musical medley that caught the delivery guy by surprise.
See the video after the break.
(via Laughing Squid)