During his last moments in the Oval Office, former President Ronald Reagan scribbled a note for his successor on a notepad with a turkey insignia that said “Don’t let the turkeys get you down.” He, too, slipped the note in the presidential desk for his successor, President George H.W. Bush.

Four years after that, the elder Bush left a note for President Bill Clinton. And eight years after that, Clinton wrote a note for Bush, and included a copy of the message he had received from Bush’s father.