when that key goes into the acid, as soon as it goes in their you wont be able to use it cos its fucked it up. Or with that shotty, the guy who killed his son has a ipod around his neck with a chain, you'd rip that off and tie it to the keys and pull it out... but no coincidentally for some reason the judge stands right in front of the gun
Im been told Saw 4 has alreay been made or something, either way I think its obvous, the guy has to find his daughter.