From The Economist:

France's greatest lexicographer, Emile Littre', was once found by
his wife, in flagrante, and in the conjugal bedroom at that, with their
housemaid. 

The exchange that followed makes sense almost as well in 
English as in French:

"Emile," cried Mrs Littre', "I am surprised!"  "No, my dear," replied
the erring lexicographer calmly.  "You are astonished.  It is we who are
surprised."