'Sit Down, You're Rockin' the Boat' comes from Frank Loesser's Broadway musical Guys and Dolls, which premiered in 1950, with the number performed by the character Nicely-Nicely Johnson. The song became one of Broadway's most recognisable showstoppers and was featured in the 1955 film adaptation. Its nagging, gospel-tinged chorus made it a natural fit for memes and short videos, where the title phrase works as shorthand for telling someone to stop causing trouble.