QUESTION:
What is the least common Birthday in America?

TRICK ANSWER: Feb 29.

ANSWER IF WE DISALLOW FEB 29: May 22. Nobody seems to know why.

I call this a trick question, not a stupid question.
I'd be curious why May 22 is so uncommon.
(Most common birthday: 
Oct 5. Possibly because its about 9 months after New Years Eve.)