Freezer Alarm

You will need...
1. Water
2. Film canister
3. A pinch of salt
4. Wire
5. Small battery
6. Cheap alarm from Radio Shack

Procedure
1. Connect alarm to battery
2. Cut wire connecting wire to battery in half
3. Place 2 exposed wires (One from the alarm, one from the battery) in the film canister
4. Fill canister with water
5. Add salt
6. Freeze

When your freezer stops working, the salt water melts, conducts current, alarm goes off