La Grande Vadrouille (1966): During WWII a British aircraft is shot down by German Nazis over Paris. The members of the crew land by parachute and with the help of two Frenchmen, they try to escape to the South where France is not yet occupied. 

A bit of context for this scene for those of you who hasn’t seen it. Bourvil (left) and De Funès (right) are singing/mumbling the song ‘Tea for two’ to this mustache man because the English soldiers told them their Captain had a “big mustache”. The song is their sign to recognize one another and Bourvil and De Funès were sent to the Bains Turcs to get help for the soldiers.