Changing my Birthday

My dad was born really close to Christmas and always talks about how he'd like to change his birthday. He doesn't have a facebook account, but if he did then he could put a different birthday on there. I think it would be funny to change my birthday on facebook and see how many of my "friends" wished me a happy one. I hear that this stunt has been done before. I imagine it's pretty effective at drawing birthday wishes on a day that's not actually your birthday.