I mean, what is an un-birthday present?" A present given when it isn't your birthday, of course." Alice considered a little. "I like birthday presents best," she said at last. You don't know what you're talking about!" cried Humpty Dumpty. "How many days are there in a year?" Three hundred and sixty-five," said Alice. And how many birthdays have you?" One.

The Lewis Carroll Book (ed. 1936)