"When was the first day of your last menstrual cycle?"
As long as I've been going for annual pap smears, that has been the hardest question in the world for me to answer. I usually stare blankly at the nurse and emit an intelligent-sounding noise like, "Uhhh...." Then I just arbitrarily pick a date a few weeks ago. Seriously. I have never had any idea as to the answer that question, besides, "uhhhh.....whenever my birth control placebos started last?"
So, if anything, at least now I will be able to answer that question!