Picture of Save my seat alarm!!!
If you want this to happen please continue!!!
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Step 1: Step1

Picture of step1
Get out the snap circuits 303 set and if you don't have it I'm pretty sure you can get the parts you need. You need parts B1 and W1. P.S. this isn't a taser!!!

Step 2: Step2

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Put them together as shown. Connect the circuit. If there  is no sound (high pitched)  turn W1 around and try connecting them again.

Step 3: Step3

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Slide your device into the sofa.

Step 4: Step4

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Cover it up with a blanket (quilt, bed sheet, pillow, etc.).

Step 5: Step 6

Picture of step 6
Sit on it, if it doesn't work tweak it. This prank you can play any day and never have too much trouble!