"Mothers of River City, heed that warning before it's too late! Watch for the telltale signs of corruption! The minute your son leaves the house, does he rebuckle his knickerbockers below the knee? Is there a nicotine stain on his index finger? A dime-novel hidden in the corncrib? Is he starting to memorize jokes from Captain Billy's Whiz-Bang? Are certain words creeping into his conversation? Words like "swell" and "so's your old man"? If so my friends, ya got trouble!"
The Music Man (1962)