Wait, you mean ME?!

I've got a pretty big meeting tomorrow at Big Fancy University with a bunch of people I haven't met before.  It's going to take a concerted effort not to giggle when somebody refers to me as Dr. [My Last Name].  I'm pretty sure the only people who have called me Dr. [My Last Name] are friends or family who are mostly joking.  It doesn't help that Dr. [My Last Name] could also refer to my mother, father, or grandfather.  Which is ridiculous, I know, but you can probably understand now how I grew up thinking it was totally normal to go to graduate school.  Anyways, giggling when somebody addresses me as Dr. (as they should damnit!) probably doesn't do much for my credibility...