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Jim's Mario's (5x22)

Air date: May 18, 1983

Jim decides to buy Mario's with some of his inheritance money, but first must convince his brother Tom (who controls his trust fund) that this is a wise investment. Initially, Mario's is doing poorly and Tom threatens not to let Jim have any more money, but the gang usher their customers into Mario's and soon the place is packed and everyone is having a great time. All appears well until a man tries to buy liquor from Jim after hours and then reveals himself to be an undercover liquor authority officer. But wait-- Jim has given him a bottle of seltzer, not liquor and saves face with his brother.