Swing Your Partner (movie, 1943)

Caroline Bird, the crotchety and stingy owner of Bird Milk Products, is not amused when her employees at the Dairyville factory, the oldest plant in the company, broadcast a special radio program in honor of her birthday. Employees Lulubelle, Scotty and Vera Vague, fed up with the terrible working conditions at Dairyville, cut into the broadcast, and Lulubelle asserts that Caroline is a "big hunk of cheese." Lane, the factory manager, cannot find the culprit, and so Caroline goes with her secretary, Dale Evans, to Dairyville.