Arduino
Haunted Mansion Display
TheNewHobbyist did this hacked together Aruduino-based “singing busts” project in 2010. The kit is activated by motion, most likely Trick-or-Treaters walking up the steps next week, and effectively delivers one component of this classic 1969 ride to his front porch.
Arduino Air drums

Air Drums based on Arduino platform, MIDI device, 3 accelerometers, light sensor, USB hub, havaianas sandals & 2 hand rakes :-)

Rik Kretzinger grew up on a Christmas tree farm and spent his college years studying horticulture, but he found it too difficult to make a living as a small farmer so he spent most of his career working for others.

A few years ago, he began to tinker with aquaponics (fishfarming + hydroponics), sensors and the open-source microcontroller Arduino to create an automated garden that could compete with commercial farms.
Internet of Farming: Arduino-based, backyard aquaponics