I am no master electrician, but if I was, I would install a motion sensor that raised and lowered a giant candy bar. Whenever the sensor detected motion it would raise the candy bar, when all was still it would lower the candy bar.
That would drive the kids nuts! It would be fun though.
When I am not carving pumpkins, I run a bulletproof vest company. BulletSafe Bulletproof Vests are the value leader in body armor. We are very popular with people like armored car operators and ATM repairmen.