Perhape one too many?

    "Oh, hallo, Aunt Daphne," he said. "Where are you off to?"

    "I am going to bed. I have a headache. Why are you so late, Esmond?"

    "Well, if you ask me," said Esmond cheerily, "I'd say it was because I didn't arrive sooner."

    "Colonel and Mrs. Kegley-Bassington were most surprised. They could not understand why you were not here."

    Esmond uttered a ringing laugh. "Then they must be the most priceless fatheads," he said. "You'd think a child would have realized that the solution was that I was somewhere else."

(from The Mating Season, by Sir Pelham Wodehouse)