Trivial Trivia - taking trivia to new levels

[RJNorton]

During the time in which the Lincolns lived at the Globe Tavern Abraham often went outside to get water in the evenings. Sometimes a crowd gathered around him listening to his stories. On occasion this activity would continue for hours, and Mary developed a certain signal that it was time for him to come back to their room on the second floor. What did Mary do to indicate to Abraham that it was time to come in?