There are many reasons why British summers are either non-existent or, alternatively, held on a Thursday. Many of these reasons are either scientific, mad, or both-but all of them are wrong, especially the scientific ones. The real reason why it rains perpetually from January 1st to December 31st is, of course, irritable Chinese Water Dragons.
— Tom Holt, Nothing But Blue Skies
And I thought the essence of a Ninja is the secrecy. Sometimes I am SO old fashioned.
Only on this special day are you allowed to show yourself. During the rest of the year, identity must remain secure. :)