On this day in 1976, Happy Days spin-off Laverne and Shirley, featuring two Milwaukee women who work on a brewery assembly line, debuts in prime time. The show starred Penny Marshall, sister of producer Garry Marshall, and Cindy Williams. Fierce rivalry erupted between the two stars, and Williams left the show in 1982. The show lasted only one more season before its cancellation in 1983.

(With thanks to History.com)