Allergy Shot

So I was sitting at the allergy office getting my weekly two shots in the arm...and waiting to answer the same question I am asked every week to make sure I am who I am...Can I have your birthday? (yes, I realize this is a thorough screening process)..
So my question to you is - How do you think I answer this question?
A) 10-23-77
B) Do you not have a birthday?  And why would you want mine?
C) Sorry, it is not for sale.

I was also sitting behind a guy who had just a wonderful t-shirt on...
Reason #426 NOT TO BE THAT GUY...STD does not stand for So Totally Drunk. 

Really?  It doesn't?  Pretty sure thats not what 99% of people think it stands for...