The story is based on the farce Le truc du Brésilien by Nicolas Nancey and Paul Armont, and the musical takes its title from the catch-phrase used by Bobby Summers and Mabel Mannering, addressing Uncle Brabazon Hollybone.

It was produced by George Grossmith, Jr. and Edward Laurillard and opened at the Prince of Wales Theatre in London on 16 December 1917 and ran for a very successful 626 performances.

Stark, Margaret Bannerman as Joan and Leslie Henson as Bobby Summers.

Audiences wanted light and uplifting entertainment during the war, and these shows delivered it.

The couple have a quarrel about whether to attend the Four Arts Ball, and Bobby goes on his own, disguised as a French count, in which guise he successfully deceives both Mabel and an old flame, Lolita.