Sanford and Son - Season 6 Episode 9
Fred's Extra Job

Lamont threatens once again to leave the junk business on account that they arent making much money. However, he also wants to quit and get a full-time job due to his impending nuptials. Fred then hatches a scheme by borrowing money from the bank and pretending that business is picking up big time, while secretly working as a waiter at a restaurant down town.