President Calvin Coolidge once invited friends from his hometown to dine at the White House.
Worried about their table manners, the guests decided to do everything that Coolidge did.
The strategy succeeded, until coffee was served. The president poured his coffee into the saucer. The guests did the same. Coolidge added sugar and cream. His guests did, too.
Then Coolidge bent over and put his saucer on the floor for the cat.