Doonesbury by Garry Trudeau for September 04, 1989
Transcript:
The Bush White House. By all accounts, an open and hospitable executive mansion. Yet cordiality has its limits, and one morning they are unexpectedly tested...when, during her daily swim, the first lady encounters a most unwelcome guest...a rat. Rat: 'Morning Mrs. B! Mind if I join you?
Actual event (the rat swimming by Barbara Bush).