If You Can Get Access To The Victim's Key Chain Is To Switch All His Keys For Keys That Look Exactly The Same, But Don't Fit The Locks He's Trying To Open.

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If you can get access to the victim's key chain is to switch all
his keys for keys that look exactly the same, but don't fit the locks
he's trying to open. If you can be around for this one, it's much more
fun to watch the person go crazy as he cannot open anything he owns.

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