My father was sick of getting his mailbox smashed by hooligan kids. He'd gone through 3 or 4 in a month. So he finally got a hold of the mailman, and asked him to do him a small favor.... more to come.

So my dad goes and buys the BIGGEST metal mailbox he could find at the bigbox store. He also bought a bag of quickrete. He also got a tiny tiny mailbox. He bolted the tiny mailbox to the side opposite of where the mailboxes had been getting smashed.... then he filled the big mailbox fill of concrete and painted the thing BRIGHT GLOSSY RED.

So the mailman knew to put the mail in the smaller one, and sure as hell, a week later dad noticed the paint scratched on the big mailbox. No dent, just a scratch. He also noticed automotive glass all over the ground from the mailbox and running 20 feet down the street.

While walking our dog, my Mom saw a car in the neighborhood that was driving by one of the teenagers that lived there. It was missing its passenger's side rear glass.

Wooden baseball bats recoil pretty badly when they strike things harder than they are I guess :P