Boing Boing had a post about three amazing mailboxes designed to deter, punish, or catch mailbox vandals and mail thieves.
One mailbox transfers “skunk oil” on a vandals baseball bat (Company literature states: “We hope that some of the skunk oil gets wiped onto clothing and car upholstery.”)
Another is designed to “grab” a bat when someone swings it into the mailbox. (“Upon direct impact with a wooden bat, the plastic tube deforms and the bat is grabbed out of the hand of the swinger.”)
The third mailbox contains a wireless tamper-detecting sensor. (“When the door of the mailbox is opened, a chime in the house is followed by a visual green light to inform you that mail has been delivered, that the mailbox door has been opened at midnight, or that the mailbox has received an impact.”)