going postal.

There was a raving lunatic at the post office, upset because someone had left a dead rat in his mailbox. The postal worker suggested he go to the police, but he was hesitant: "It's not like the New London police could have captured the unabomber!"

He carried the rat around in a metal box, trying to find sympathy or at least a new place to put it down. A woman in line said, "I think he's mentally disturbed."