From the movie Full Metal Jacket, directed by Stanley Kubrick
HARTMAN marches the recruits through the squad bay. Their rifles are
at shoulder arms and their left hands clutch their genitals.
HARTMAN: This is my rifle! This is my gun!
RECRUITS: This is for fighting! This is for fun!
HARTMAN: This is my rifle! This is my gun!
RECRUITS: This is my rifle! This is my gun!
They repeat this over and over again as they march up and down the
squad bay.