Laverne & Shirley (1976)

Season 2: Episode 6

After a party at the brewery, Laverne comes home to find she's wearing a pair of men's boxer shorts. She starts to feel ill in the mornings but was so drunk the night before that she can't remember what happened. She fears that she's pregnant. So Lenny and Squiggy have a contest to see which of them will ask Laverne to marry them, Lenny wins and in a touching scene proposes to Laverne, of course in the end we discover that Laverne is not pregnant and that she was wearing the boxer shorts because she had been made an honorary guy at the brewery.