Mr Pim Passes By is a three act comedy by A. A. Milne, first produced in 1919, and seen in the West End in 1920 and on Broadway and in Australia in 1921. There were later stage revivals in London and New York, and the play has been adapted for radio, television and cinema. The play centres on the turbulence in a respectable English household when the fallible memory of an elderly visitor leads a husband and wife to believe that they may inadvertently be bigamously married. Source: Wikipedia (en)