If you are a mom who remembers your kid's birthday, its normal. If you are a father who can do that, you might just be an alien spy with evil plans for humanity.
HOW TO CONFIRM YOUR FATHER HAS BEEN REPLACED BY AN ALIEN; ALIEN SPY; "WHAT IS YOUR DAUGHTER'S DATE OF BIRTH?"; "JUNE 1ST 2007. SHE WAS BORN AT 12:55PM AND WAS 7LBS 3 OZ. IT WAS 84 DEGREES THAT DAY AND MOSTLY CLOUDY."; REAL DAD; "WHAT IS YOUR DAUGHTER'S DATE OF BIRTH?"; "DAUGHTER? BORN? OH YEAH SHE WAS BORN I GUESS. CAN YOU JUST SAY 2000? OR 21ST CENTURY? LET ME CALL MY WIFE."