Something like this DID happen here, but with a different result:
http://www.dailybreeze.com/news/ci_13740480"Live grenade at gun exchange
From wire reports
Posted: 11/07/2009 09:05:15 PM PST
Inglewood police collected more than 100 guns during the first hour of a Gifts for Guns exchange Saturday, but the bomb squad had to be called out when someone took in a live hand grenade to exchange for a promised $100 gift card.
Police were not expecting the grenade and because officers had promised "no questions asked," no one was charged.
Police asked residents in the future to call ahead if they have any unusual items such as hand grenades or mortars.
More information about the Gifts for Guns program is available at the Inglewood Police Department's Community Affairs Section at 310-412-5530.
- City News Service "