"They gave it me," Humpty Dumpty continued thoughtfully, as he crossed one knee over the other and clasped his hands round it, "they gave it me⸺for an un-birthday present." / "I beg your pardon?" Alice said with a puzzled air." / "I'm not offended," said Humpty Dumpty. / "I mean, what is an un-birthday present?" / "A present given when it isn't your birthday, of course."
Source: wiktionary
Hunting for treasures on any special day (like Easter, Christmas, birthdays or unbirthdays) can be fun for children and parents alike.
Source: wiktionary
Another way to look at unbirthdays is as an opportunity to celebrate every day of life. You can throw a party for no particular reason, except for FUN!
Source: wiktionary
Make an unbirthday cake and wear party hats when you blow out the candles together.
Source: wiktionary
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