Coffee mug (Fallout 3)

The  is a type of beverage container. Intended originally for the containment and transportation of hot coffee, this mug is soon used for other beverages, like tea or hot cocoa. These cups can be found in the Vaults. They are useful as ammo for the Rock-It Launcher.

A Great Place to find a lot of coffee mugs(~30) is in the robot repair center when you first enter the building.