From Star Wars: Episode VI - Return of the Jedi
[In the throne room, Luke is watching the Imperial fleet attack the Rebels from the huge throne room window
] As you can see, my young apprentice, your friends have failed. Now witness the firepower of this fully ARMED and OPERATIONAL battle station!
[the Emperor hits the comlink switch on his throne
Fire at will, Commander!
[In the Death Star's firing room, a group of hooded Imperial gunners starts priming the Death Star's superlaser - a device so advanced it can be trained on capital ships, such as the Rebel aircraft carriers. A series of tones signify that the weapon is ready