It was the best example of good manners she had ever seen.

From Trying to Please by John Julius Norwich.  Page 94.  

Best of all I remember an evening when Christian Bérard—always known as Bébé—painter, designer, and book illustrator, gloriously unkempt, with hair to his shoulders and a bushy brown beard full of cigarette ash (twenty years later it would hardly have been noticed, but the style was rare indeed in the 1940s), turned up with his pet pug under his arm. Soon after his arrival he put it on the floor, where it instantly deposited a formidable turd. Bébé, horrified, unhesitatingly—and to the immense admiration, it must be said, of all around him—picked it up and put it in his pocket. My mother always said that it was the best example of good manners she had ever seen.