I was recently asked by a reporter to comment on the 1950s I Love Lucy episode where Lucy and Ethel work in a chocolate factory. It's called "Job Switching".
As I remember it, Ricky wants Lucy to try working for a week so she can learn the value of the almighty dollar as she's just come home with another expensive dress. Lucy and Ethel get jobs at a candy factory. They try their hands at "dipping" chocolate centers and lacking grace or experience they soon have chocolate all over themselves and the factory. Lucy ends up with a chocolate covered face. They are then moved to a chocolate packing room. At first it's delightful and exciting, delicious and perfect chocolates are dancing down a production line on a conveyor belt. Their job is to wrap the chocolate in candy cups. Quickly, their sweet excitement turns sour as they can't keep up with a speeding conveyor belt. They begin stuffing chocolates in their mouths, blouses, and hats.
The episode was filmed a the See's Candy plant in Los Angeles and first aired in 1952. It's delightful to watch!